Health Statistics Quarterly Office For National Statistics, Feb 1, 2007
Gestational age is highly correlated with birth outcomes including birthweight and infant mortali... more Gestational age is highly correlated with birth outcomes including birthweight and infant mortality. Since gestational age is not recorded at the registration of live births in England and Wales, it has not been possible to produce routine statistics on gestation-specific infant mortality rates. A new system, introduced in 2002, for allocating NHS numbers at birth (NN4B) provided the opportunity to obtain gestational age information. NN4B records have been linked with birth registration data for all births occurring in 2005, and further linked with registration records for deaths in the first year of life. Thus, for the first time, we produce gestation-specific infant mortality rates for England and Wales as a whole, including in relation to birthweight, multiplicity, age of mother, marital status/registration type, and the National Statistics Socio-Economic Classification.
Birthweight remains one of the strongest predictors of perinatal mortality and disability. Birthw... more Birthweight remains one of the strongest predictors of perinatal mortality and disability. Birthweight percentiles form a reference that allows the detection of neonates at higher risk of neonatal and postneonatal morbidity. The aim of the study is to present updated national birthweight percentiles by gestational age for male and female twins born in Australia. Population data were extracted from the Australian National Perinatal Data Collection for twins born in Australia between 2001 and 2010. A total of 43,833 women gave birth to 87,666 twins in Australia which were included in the study analysis. Implausible birthweights were excluded using Tukey's methodology based on the interquartile range. Univariate analysis was used to examine the birthweight percentiles for liveborn twins born between 20 and 42 weeks gestation. Birthweight percentiles by gestational age were calculated for 85,925 live births (43,153 males and 42,706 females). Of these infants, 53.6 % were born preter...
Health statistics quarterly / Office for National Statistics
This paper investigates the quality of information in the National Health Service (NHS) Numbers f... more This paper investigates the quality of information in the National Health Service (NHS) Numbers for Babies (NN4B) dataset and provides statistics on gestational age at birth in relation to live/stillbirth status, multiple birth status, age of mother, babies' sex, and birthweight. Gestational age information is not recorded at the registration of live births and the NN4B system provides the opportunity to access this information for all live and stillbirths in England and Wales. All NN4B records for babies born in England and Wales in 2005 were used in this analysis. Data quality was generally good although some aspects need further investigation. The gestational age data are credible, consistent with other U.K. data sources, and the statistics by maternal age, multiplicity and sex are as expected. These data, previously unavailable for England and Wales as a whole, provide a reference against which to monitor trends in preterm births and can inform the planning of neonatal care provision. NN4B is a powerful new data source which can extend
AIHW In 2012, 307,474 women gave birth to 312,153 babies in Australia. This was an increase of 10... more AIHW In 2012, 307,474 women gave birth to 312,153 babies in Australia. This was an increase of 10,343 births (3.4%) from that reported in 2011, and a total increase of 21.5% since 2003. Nationally, the proportion of teenage mothers (younger than 20) declined from 3.7% in 2011 to 3.6% in 2011, compared with 4.6% in 2003.
Background: One of the findings of the 2009 review of maternity services, led by the Commonwealth... more Background: One of the findings of the 2009 review of maternity services, led by the Commonwealth Chief Nurse and Midwifery Officer was a lack of consistent national recording and reporting of maternity-related data. Following publication of this report, the AIHW National Perinatal Epidemiology and Statistics Unit conducted a review of relevant Australian data collections to determine the current depth and breadth of maternal and perinatal health-related data capture in Australia. A total of 45 different data collections were located and reviewed. Method: Using information provided by data custodians, managers and published reports, an index and summary of all available data items pertaining to maternal and perinatal health was developed in 2010. This index was subsequently reviewed and updated in 2011. Information about each data item and the collection it was contained in was recorded in a central database, including descriptive information, definitions, availability and scope of ...
Health statistics quarterly / Office for National Statistics, 2008
This paper investigates the quality of information in the National Health Service (NHS) Numbers f... more This paper investigates the quality of information in the National Health Service (NHS) Numbers for Babies (NN4B) dataset and provides statistics on gestational age at birth in relation to live/stillbirth status, multiple birth status, age of mother, babies' sex, and birthweight. Gestational age information is not recorded at the registration of live births and the NN4B system provides the opportunity to access this information for all live and stillbirths in England and Wales. All NN4B records for babies born in England and Wales in 2005 were used in this analysis. Data quality was generally good although some aspects need further investigation. The gestational age data are credible, consistent with other U.K. data sources, and the statistics by maternal age, multiplicity and sex are as expected. These data, previously unavailable for England and Wales as a whole, provide a reference against which to monitor trends in preterm births and can inform the planning of neonatal care ...
Health statistics quarterly / Office for National Statistics, 2007
Gestational age is highly correlated with birth outcomes including birthweight and infant mortali... more Gestational age is highly correlated with birth outcomes including birthweight and infant mortality. Since gestational age is not recorded at the registration of live births in England and Wales, it has not been possible to produce routine statistics on gestation-specific infant mortality rates. A new system, introduced in 2002, for allocating NHS numbers at birth (NN4B) provided the opportunity to obtain gestational age information. NN4B records have been linked with birth registration data for all births occurring in 2005, and further linked with registration records for deaths in the first year of life. Thus, for the first time, we produce gestation-specific infant mortality rates for England and Wales as a whole, including in relation to birthweight, multiplicity, age of mother, marital status/registration type, and the National Statistics Socio-Economic Classification.
Health statistics quarterly / Office for National Statistics, 2007
Information about gestational age is important but is not available for live births from registra... more Information about gestational age is important but is not available for live births from registration data. It is, however, collected in NHS Numbers for Babies (NN4B) records. This project investigates the feasibility of linking NN4B data for births in the First quarter of 2005 with birth registration records. Overall 99.8 per cent of NN4B records linked with a registration record. Accuracy of linkage was questioned in 0.9 per cent. Live/stillbirth and multiple birth status were each differently classified in approximately 1 per 1,000 records. Discordance rates for other individual data items ranged from 0.3 per cent for date of birth to 12.9 per cent for postcode. Although needing further investigation, these results justify extending the linkage to the remainder of births in 2005. Linkage would be improved by retaining NHS numbers on stillbirth registration records and avoiding manual transfer of NHS numbers.
Studies from the United States and the United Kingdom have found that imprisoned women are less l... more Studies from the United States and the United Kingdom have found that imprisoned women are less likely to experience poorer maternal and perinatal outcomes than other disadvantaged women. This population-based study used both community controls and women with a history of incarceration as a control group, to investigate whether imprisoned pregnant women in New South Wales, Australia, have improved maternal and perinatal outcomes. Retrospective cohort study using probabilistic record linkage of routinely collected data from health and corrective services in New South Wales, Australia. Comparison of the maternal and perinatal outcomes of imprisoned pregnant women aged 18-44 years who gave birth between 2000-2006 with women who were (i) imprisoned at a time other than pregnancy, and (ii) community controls. onset of labour, method of birth, pre-term birth, low birthweight, Apgar score, resuscitation, neonatal hospital admission, perinatal death. Babies born to women who were imprisoned...
Objective-To demonstrate the use of aggregated, locally collected birth notification data to exam... more Objective-To demonstrate the use of aggregated, locally collected birth notification data to examine trends in birthweight specific survival for singleton and multiple births. Design-Retrospective analysis of 171 527 notified births and subsequent infant survival data derived from computerised community child health records. Validation of data completeness and quality was undertaken by comparison with birth and death registration records for the same period.
International Journal of Environmental Research and Public Health, 2014
Background: Previous research showed that there was a significant increase in psychiatric hospita... more Background: Previous research showed that there was a significant increase in psychiatric hospital admission of postpartum mothers. The aim of the current study is to describe the length of hospital stays and patient days for mental and behavioural disorders (MBD) of new mothers in the first year after birth. Method: This was a cohort study based on linked population data between the New South Wales (NSW) Midwives Data Collection (MDC) and the NSW Admitted Patients Data Collection (APDC). The study population included primiparous mothers aged from 18 to 44 who gave birth between 1 July 2000 and 31 December 2005. The Kaplan-Meier method was used to describe the length of hospital stay for MBD. Results: For principal diagnoses of MBD, the entire length of hospital stay in the first year postpartum was 11.38 days (95% CI: 10.70-12.06) for mean and 6 days (95% CI: 5.87-6.13) for median. The length of hospital stay per admission was 8.47 days (95% CI: 8.03-8.90) for mean and 5 days (95% CI: 4.90-5.10) for median. There were 5,129 patient days of hospital stay per year for principal diagnoses of postpartum MBD in new mothers between 1
European Journal of Obstetrics & Gynecology and Reproductive Biology, 2007
Objective: In England an estimated 50,000 inductions of labour at or beyond 41 weeks' gestation a... more Objective: In England an estimated 50,000 inductions of labour at or beyond 41 weeks' gestation are conducted each year. However, the published evidence on the effect of parity on stillbirth in prolonged pregnancy is limited, and has produced conflicting data. The aim of this study is to evaluate the influence of parity on fetal mortality in prolonged pregnancies. Study design: Retrospective analysis of 145,695 singleton births with known parity and no malformation noted at birth to residents in the former North-East Thames Region, UK. The parity and gestation specific stillbirth risks and relative risks per 1000 ongoing pregnancies were calculated in relation to parity between 37 and 45 weeks. Results: Before 41 weeks the stillbirth risk rose gradually but did not differ by parity. By 41 weeks there was a substantial increase in the stillbirth risk in nulliparous women but not in parous women. The pattern of rise is such that the stillbirth risk is 2.9 times higher (95% CI 1. 06-8.19) in nulliparous women at >42 weeks' gestation. Conclusion: Being parous appears to have a protective effect on fetal mortality in prolonged pregnancy. These findings question the need for routine induction of labour at 41 weeks in parous women. #
In recent years there has been an increase in the use of population-based linked data. However, t... more In recent years there has been an increase in the use of population-based linked data. However, there is little literature that describes the method of linked data preparation. This paper describes the method for merging data, calculating the statistical variable (SV), recoding psychiatric diagnoses and summarizing hospital admissions for a perinatal psychiatric study.
Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. Th... more Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.
Neonatal abstinence syndrome (NAS) occurs after in utero exposure to opioids, but outcomes after ... more Neonatal abstinence syndrome (NAS) occurs after in utero exposure to opioids, but outcomes after the postnatal period are unclear. Our objectives were to characterize childhood hospitalization after NAS. Population-based linkage study of births, hospitalization, and death records of all children registered in New South Wales (NSW), Australia, between 2000 and 2011 to a maximum of 13 years. Infants with an International Statistical Classification of Disease and Related Problems, 10th Edition, Australian Modification, coding of NAS (P96.1, n = 3842) were compared with 1 018 421 live born infants without an NAS diagnosis. Infants with NAS were more likely to be admitted into a nursery (odds ratio 15.6, 95% confidence interval: 14.5-16.8) and be hospitalized longer (10.0 vs 3.0 days). In childhood, they were more likely to be rehospitalized (1.6, 1.5-1.7), die during hospitalization (3.3, 2.1-5.1), and be hospitalized for assaults (15.2, 11.3-20.6), maltreatment (21.0, 14.3-30.9), poiso...
Health Statistics Quarterly Office For National Statistics, Feb 1, 2007
Gestational age is highly correlated with birth outcomes including birthweight and infant mortali... more Gestational age is highly correlated with birth outcomes including birthweight and infant mortality. Since gestational age is not recorded at the registration of live births in England and Wales, it has not been possible to produce routine statistics on gestation-specific infant mortality rates. A new system, introduced in 2002, for allocating NHS numbers at birth (NN4B) provided the opportunity to obtain gestational age information. NN4B records have been linked with birth registration data for all births occurring in 2005, and further linked with registration records for deaths in the first year of life. Thus, for the first time, we produce gestation-specific infant mortality rates for England and Wales as a whole, including in relation to birthweight, multiplicity, age of mother, marital status/registration type, and the National Statistics Socio-Economic Classification.
Birthweight remains one of the strongest predictors of perinatal mortality and disability. Birthw... more Birthweight remains one of the strongest predictors of perinatal mortality and disability. Birthweight percentiles form a reference that allows the detection of neonates at higher risk of neonatal and postneonatal morbidity. The aim of the study is to present updated national birthweight percentiles by gestational age for male and female twins born in Australia. Population data were extracted from the Australian National Perinatal Data Collection for twins born in Australia between 2001 and 2010. A total of 43,833 women gave birth to 87,666 twins in Australia which were included in the study analysis. Implausible birthweights were excluded using Tukey's methodology based on the interquartile range. Univariate analysis was used to examine the birthweight percentiles for liveborn twins born between 20 and 42 weeks gestation. Birthweight percentiles by gestational age were calculated for 85,925 live births (43,153 males and 42,706 females). Of these infants, 53.6 % were born preter...
Health statistics quarterly / Office for National Statistics
This paper investigates the quality of information in the National Health Service (NHS) Numbers f... more This paper investigates the quality of information in the National Health Service (NHS) Numbers for Babies (NN4B) dataset and provides statistics on gestational age at birth in relation to live/stillbirth status, multiple birth status, age of mother, babies' sex, and birthweight. Gestational age information is not recorded at the registration of live births and the NN4B system provides the opportunity to access this information for all live and stillbirths in England and Wales. All NN4B records for babies born in England and Wales in 2005 were used in this analysis. Data quality was generally good although some aspects need further investigation. The gestational age data are credible, consistent with other U.K. data sources, and the statistics by maternal age, multiplicity and sex are as expected. These data, previously unavailable for England and Wales as a whole, provide a reference against which to monitor trends in preterm births and can inform the planning of neonatal care provision. NN4B is a powerful new data source which can extend
AIHW In 2012, 307,474 women gave birth to 312,153 babies in Australia. This was an increase of 10... more AIHW In 2012, 307,474 women gave birth to 312,153 babies in Australia. This was an increase of 10,343 births (3.4%) from that reported in 2011, and a total increase of 21.5% since 2003. Nationally, the proportion of teenage mothers (younger than 20) declined from 3.7% in 2011 to 3.6% in 2011, compared with 4.6% in 2003.
Background: One of the findings of the 2009 review of maternity services, led by the Commonwealth... more Background: One of the findings of the 2009 review of maternity services, led by the Commonwealth Chief Nurse and Midwifery Officer was a lack of consistent national recording and reporting of maternity-related data. Following publication of this report, the AIHW National Perinatal Epidemiology and Statistics Unit conducted a review of relevant Australian data collections to determine the current depth and breadth of maternal and perinatal health-related data capture in Australia. A total of 45 different data collections were located and reviewed. Method: Using information provided by data custodians, managers and published reports, an index and summary of all available data items pertaining to maternal and perinatal health was developed in 2010. This index was subsequently reviewed and updated in 2011. Information about each data item and the collection it was contained in was recorded in a central database, including descriptive information, definitions, availability and scope of ...
Health statistics quarterly / Office for National Statistics, 2008
This paper investigates the quality of information in the National Health Service (NHS) Numbers f... more This paper investigates the quality of information in the National Health Service (NHS) Numbers for Babies (NN4B) dataset and provides statistics on gestational age at birth in relation to live/stillbirth status, multiple birth status, age of mother, babies' sex, and birthweight. Gestational age information is not recorded at the registration of live births and the NN4B system provides the opportunity to access this information for all live and stillbirths in England and Wales. All NN4B records for babies born in England and Wales in 2005 were used in this analysis. Data quality was generally good although some aspects need further investigation. The gestational age data are credible, consistent with other U.K. data sources, and the statistics by maternal age, multiplicity and sex are as expected. These data, previously unavailable for England and Wales as a whole, provide a reference against which to monitor trends in preterm births and can inform the planning of neonatal care ...
Health statistics quarterly / Office for National Statistics, 2007
Gestational age is highly correlated with birth outcomes including birthweight and infant mortali... more Gestational age is highly correlated with birth outcomes including birthweight and infant mortality. Since gestational age is not recorded at the registration of live births in England and Wales, it has not been possible to produce routine statistics on gestation-specific infant mortality rates. A new system, introduced in 2002, for allocating NHS numbers at birth (NN4B) provided the opportunity to obtain gestational age information. NN4B records have been linked with birth registration data for all births occurring in 2005, and further linked with registration records for deaths in the first year of life. Thus, for the first time, we produce gestation-specific infant mortality rates for England and Wales as a whole, including in relation to birthweight, multiplicity, age of mother, marital status/registration type, and the National Statistics Socio-Economic Classification.
Health statistics quarterly / Office for National Statistics, 2007
Information about gestational age is important but is not available for live births from registra... more Information about gestational age is important but is not available for live births from registration data. It is, however, collected in NHS Numbers for Babies (NN4B) records. This project investigates the feasibility of linking NN4B data for births in the First quarter of 2005 with birth registration records. Overall 99.8 per cent of NN4B records linked with a registration record. Accuracy of linkage was questioned in 0.9 per cent. Live/stillbirth and multiple birth status were each differently classified in approximately 1 per 1,000 records. Discordance rates for other individual data items ranged from 0.3 per cent for date of birth to 12.9 per cent for postcode. Although needing further investigation, these results justify extending the linkage to the remainder of births in 2005. Linkage would be improved by retaining NHS numbers on stillbirth registration records and avoiding manual transfer of NHS numbers.
Studies from the United States and the United Kingdom have found that imprisoned women are less l... more Studies from the United States and the United Kingdom have found that imprisoned women are less likely to experience poorer maternal and perinatal outcomes than other disadvantaged women. This population-based study used both community controls and women with a history of incarceration as a control group, to investigate whether imprisoned pregnant women in New South Wales, Australia, have improved maternal and perinatal outcomes. Retrospective cohort study using probabilistic record linkage of routinely collected data from health and corrective services in New South Wales, Australia. Comparison of the maternal and perinatal outcomes of imprisoned pregnant women aged 18-44 years who gave birth between 2000-2006 with women who were (i) imprisoned at a time other than pregnancy, and (ii) community controls. onset of labour, method of birth, pre-term birth, low birthweight, Apgar score, resuscitation, neonatal hospital admission, perinatal death. Babies born to women who were imprisoned...
Objective-To demonstrate the use of aggregated, locally collected birth notification data to exam... more Objective-To demonstrate the use of aggregated, locally collected birth notification data to examine trends in birthweight specific survival for singleton and multiple births. Design-Retrospective analysis of 171 527 notified births and subsequent infant survival data derived from computerised community child health records. Validation of data completeness and quality was undertaken by comparison with birth and death registration records for the same period.
International Journal of Environmental Research and Public Health, 2014
Background: Previous research showed that there was a significant increase in psychiatric hospita... more Background: Previous research showed that there was a significant increase in psychiatric hospital admission of postpartum mothers. The aim of the current study is to describe the length of hospital stays and patient days for mental and behavioural disorders (MBD) of new mothers in the first year after birth. Method: This was a cohort study based on linked population data between the New South Wales (NSW) Midwives Data Collection (MDC) and the NSW Admitted Patients Data Collection (APDC). The study population included primiparous mothers aged from 18 to 44 who gave birth between 1 July 2000 and 31 December 2005. The Kaplan-Meier method was used to describe the length of hospital stay for MBD. Results: For principal diagnoses of MBD, the entire length of hospital stay in the first year postpartum was 11.38 days (95% CI: 10.70-12.06) for mean and 6 days (95% CI: 5.87-6.13) for median. The length of hospital stay per admission was 8.47 days (95% CI: 8.03-8.90) for mean and 5 days (95% CI: 4.90-5.10) for median. There were 5,129 patient days of hospital stay per year for principal diagnoses of postpartum MBD in new mothers between 1
European Journal of Obstetrics & Gynecology and Reproductive Biology, 2007
Objective: In England an estimated 50,000 inductions of labour at or beyond 41 weeks' gestation a... more Objective: In England an estimated 50,000 inductions of labour at or beyond 41 weeks' gestation are conducted each year. However, the published evidence on the effect of parity on stillbirth in prolonged pregnancy is limited, and has produced conflicting data. The aim of this study is to evaluate the influence of parity on fetal mortality in prolonged pregnancies. Study design: Retrospective analysis of 145,695 singleton births with known parity and no malformation noted at birth to residents in the former North-East Thames Region, UK. The parity and gestation specific stillbirth risks and relative risks per 1000 ongoing pregnancies were calculated in relation to parity between 37 and 45 weeks. Results: Before 41 weeks the stillbirth risk rose gradually but did not differ by parity. By 41 weeks there was a substantial increase in the stillbirth risk in nulliparous women but not in parous women. The pattern of rise is such that the stillbirth risk is 2.9 times higher (95% CI 1. 06-8.19) in nulliparous women at >42 weeks' gestation. Conclusion: Being parous appears to have a protective effect on fetal mortality in prolonged pregnancy. These findings question the need for routine induction of labour at 41 weeks in parous women. #
In recent years there has been an increase in the use of population-based linked data. However, t... more In recent years there has been an increase in the use of population-based linked data. However, there is little literature that describes the method of linked data preparation. This paper describes the method for merging data, calculating the statistical variable (SV), recoding psychiatric diagnoses and summarizing hospital admissions for a perinatal psychiatric study.
Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. Th... more Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.
Neonatal abstinence syndrome (NAS) occurs after in utero exposure to opioids, but outcomes after ... more Neonatal abstinence syndrome (NAS) occurs after in utero exposure to opioids, but outcomes after the postnatal period are unclear. Our objectives were to characterize childhood hospitalization after NAS. Population-based linkage study of births, hospitalization, and death records of all children registered in New South Wales (NSW), Australia, between 2000 and 2011 to a maximum of 13 years. Infants with an International Statistical Classification of Disease and Related Problems, 10th Edition, Australian Modification, coding of NAS (P96.1, n = 3842) were compared with 1 018 421 live born infants without an NAS diagnosis. Infants with NAS were more likely to be admitted into a nursery (odds ratio 15.6, 95% confidence interval: 14.5-16.8) and be hospitalized longer (10.0 vs 3.0 days). In childhood, they were more likely to be rehospitalized (1.6, 1.5-1.7), die during hospitalization (3.3, 2.1-5.1), and be hospitalized for assaults (15.2, 11.3-20.6), maltreatment (21.0, 14.3-30.9), poiso...
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