The value of maternity care in Queensland, 2012–18, based on an analysis of administrative data: a retrospective observational study

Abstract Objective To quantify the value of maternity health care — the relationship of outcomes to costs — in Queensland during 2012–18. Study design Retrospective observational study; analysis of Queensland Perinatal Data Collection data linked with the Queensland Health Admitted Patient, Non‐Admitted Patient, and Emergency Data Collections, and with the Medicare Benefits Schedule (MBS) and Pharmaceutical Benefits Scheme (PBS) databases. Setting, participants All births in Queensland during 1 July 2012 – 30 June 2018. Main outcome measures Maternity care costs per birth (reported in 2021–22 Australian dollars), both overall and by funder type (public hospital funders, MBS, PBS, private health insurers, out‐of‐pocket costs); value of care, defined as total cost per positive birth outcome (composite measure). Results The mean cost per birth (all funders) increased from $20 471 (standard deviation [SD], $17 513) during the second half of 2012 to $30 000 (SD, $22 323) during the first half of 2018; the annual total costs for all births increased from $1.31 billion to $1.84 billion, despite a slight decline in the total number of births. In a mixed effects linear analysis adjusted for demographic, clinical, and birth characteristics, the mean total cost per birth in the second half of 2018 was $9493 higher (99.9% confidence interval, $8930–10 056) than during the first half of 2012. The proportion of births that did not satisfy our criteria for a positive birth outcome increased from 27.1% (8404 births) during the second half of 2012 to 30.5% (9041 births) during the first half of 2018. Conclusion The costs of maternity care have increased in Queensland, and many adverse birth outcomes have become more frequent. Broad clinical collaboration, effective prevention and treatment strategies, as well as maternal health services focused on all dimensions of value, are needed to ensure the quality and viability of maternity care in Australia.

Main outcome measures: Maternity care costs per birth (reported in 2021-22 Australian dollars), both overall and by funder type (public hospital funders, MBS, PBS, private health insurers, out-ofpocket costs); value of care, defined as total cost per positive birth outcome (composite measure).

Results:
The mean cost per birth (all funders) increased from $20 471 (standard deviation [SD], $17 513) during the second half of 2012 to $30 000 (SD, $22 323) during the first half of 2018; the annual total costs for all births increased from $1.31 billion to $1.84 billion, despite a slight decline in the total number of births.In a mixed effects linear analysis adjusted for demographic, clinical, and birth characteristics, the mean total cost per birth in the second half of 2018 was $9493 higher (99.9% confidence interval, $8930-10 056) than during the first half of 2012.The proportion of births that did not satisfy our criteria for a positive birth outcome increased from 27.1% (8404 births) during the second half of 2012 to 30.5% (9041 births) during the first half of 2018.

Conclusion:
The costs of maternity care have increased in Queensland, and many adverse birth outcomes have become more frequent.Broad clinical collaboration, effective prevention and treatment strategies, as well as maternal health services focused on all dimensions of value, are needed to ensure the quality and viability of maternity care in Australia.
The known: Medical intervention rates in maternity care, a high volume, high cost area of health care, need to be reduced to contain costs.
The new: During 2012-18, the demographic and clinical characteristics of women giving birth in Queensland changed markedly, and the proportion of births without any adverse outcomes declined from 72.9% to 69.5%.Further, the costs of maternity care increased at a rate that cannot be sustained indefinitely.
The implications: Delivering high value, high quality maternity care requires strategies for containing costs while maintaining its quality.

Research
women before and during pregnancy, as well as information about the birth and postpartum events.These data were linked with data for both women and their infants, from the start of pregnancy until 30 June 2019, in the Queensland Health Admitted Patient Data Collection (which records all inpatient events in private and public hospitals), the Queensland Health Non-Admitted Patient Data Collection (all outpatient services) and the Emergency Data Collection (all emergency department presentations).The data were then linked with Medicare Benefits Schedule (MBS) and Pharmaceutical Benefits Scheme (PBS) claims records to encompass all community-based services (including general practitioner and specialist consultations, pathology services, and diagnostic tests and imaging), private hospital services, and prescription pharmaceutical dispensing (further details: Supporting Information).De-identified data were supplied to the authors by the Australian Institute of Health and Welfare and the Queensland Health Statistical Services Branch.

Health care costs
We included costs for all health services for women during their pregnancy and until their discharge from hospital after giving birth, and for infants from birth to their discharge from hospital, overall and by health funder type (public hospital funders, MBS, PBS, private health insurers, and out-of-pocket costs).Analyses based on mean costs are reported per birth; that is, the births of multiple babies from a single pregnancy were considered as separate births.Analyses based on summed costs are reported per pregnancy to avoid double counting of multiple births.All costs were adjusted for inflation and are reported in 2021-22 Australian dollars using the Reserve Bank of Australia inflation calculator (https://www.rba.gov.au/calculator/ finan cialY earDe cimal.html).

Health care outcomes
We developed a composite birth outcome measure in an earlier study, 17 after two rounds of community consultation, based on data routinely collected in accordance with the values and principles outlined in the Australian woman-centred care: strategic directions for Australian maternity services strategy. 18Specifically, a positive birth outcome was defined as one for which none of the following adverse outcomes were recorded in the linked dataset: stillbirth; neonatal death (within thirty days of birth); admission to a special care nursery or neonatal intensive care unit; Apgar score at five minutes below 7; hypoxic-ischaemic encephalopathy; infant birth trauma (brachial plexus injury, fractured clavicle or humerus); intrauterine hypoxia; other perinatal conditions (meconium aspiration syndrome, congenital pneumonia or respiratory distress syndrome); third or fourth

Statistical analysis
We summarise the demographic and clinical characteristics of women who gave birth, perinatal outcomes, and cost per birth as descriptive statistics by year.We report the proportions of women with positive birth outcomes by year.The statistical distribution of cost per birth is reported for all births by year, as is the mean cost by funder for each year.The cost (for all births) per positive birth outcome was calculated.Changes in demographic and clinical characteristics, outcomes, and costs are reported as differences relative to 2012-13, and the statistical significance of changes was assessed in Cochrane-Armitage, Cochran-Mantel-Haenszel, or Jonckheere-Terpstra tests for trend.
We examined change over time in total costs per birth in a mixed effects linear model, with a repeated measure for mothers and a year term, and adjusted for mother's age, body mass index, Indigenous status, country of birth (Australia, other), parity, pregnancy type (singleton, multiple), pre-existing or gestational diabetes, hypertension, pre-eclampsia, iatrogenic birth at 34-37 weeks' gestation, spontaneous birth at 34-37 weeks' gestation, iatrogenic birth beyond 37 weeks, and congenital defects at birth.All variance inflation factor values were below 10 and all tolerance values above 0.1, indicating that collinearity between the included variables was not statistically significant.All analyses were conducted in SAS 9.4; P < 0.001 was deemed statistically significant.

Ethics approval
Our study was conducted in accordance with the Declaration of Helsinki.The human research ethics committees of the Townsville Hospital and Health Service (HREC/16/QTHS/223) and the Australian Institute of Health and Welfare (EO2017-1-338) approved access to and linkage and analysis of the raw data for which they are the custodians.

Results
The

Birth outcomes
The proportion of births that did not satisfy our criteria for a positive birth outcome increased from 27.1% (8404 births) during the second half of 2012 to 30.5% (9041 births) during the first half of 2018.The proportion of infant deaths declined from 0.9% (285 births) to 0.7% (219 births); the proportion for which birth trauma was recorded increased from 0.8% (240 births) to 1.4% (399 births).The proportion of births for which maternal haemorrhage was recorded increased from 6.8% (2097 births) in the second half of 2012 to 10.9% (3223 births) during the first half of 2018 (Box 3).

Birth costs
The

Discussion
We found that the mean cost per birth for maternity care in Queensland increased during 2012-18, after adjusting for clinical and demographic characteristics, by $9493.The total costs for all births increased from $1.31 to $1.84 billion, despite a slight decline in the annual number of births.The proportion of births with non-positive outcomes rose from 27.1% in the second half of 2012 to 30.5% in the first half of 2018.Specifically, the proportions of births for which maternal haemorrhage or birth trauma were recorded increased during 2012-18, and the proportion of spontaneous vaginal births beyond 37 weeks declined from 44% to 36%.
Several authors have advocated promoting better value in maternity care, and some have proposed specific strategies, including better use of contraception, tailoring perinatal care to the needs of individual women, value-based payments rather than fixed fees for services, and greater use of birth centres. 10,11These suggestions, however, have largely been based upon opinion, rather than based on evidence about how value changed over time and why.
Our study is the first to quantify change in the value of care.
Evidence for effective and cost-effective treatment or prevention options is available for many of the contributors to increasing costs we identified.For example, caseload midwifery can be cost-effective and reduce the likelihood of an iatrogenic birth compared with standard midwifery care. 19,20The federally funded Australian Preterm Prevention Alliance is seeking to reduce the rate of pre-term births by 20%. 21early identification of pre-eclampsia can also be cost-effective. 27,28Despite the many challenges for pre-conception care, evidence that health service improvements can reduce costs and improve health care outcomes has been reported. 29ordinated efforts by clinicians, health services, and public health officials will be needed to improve value care, as is a national approach to reducing documented variations in costs between Australian hospitals. 30The rising caesarean delivery rate overseas 4,14 and its long term implications for women and their children 31 has been described; many Australian women report dissatisfaction with several aspects of maternity care; 32 and in this article we report that maternity care costs are increasing.As such growth is not sustainable, given caps on federal hospital funding and generally tightening post-pandemic economic policy, all involved must work together to implement effective prevention and treatment strategies for providing consistently high value care.

Limitations
Our analysis of population-based administrative data comprehensively captured maternity care costs, rather than narrowly focusing on single episodes of care.However, the primary outcome assessed was not based on outcomes reported by pregnant women, which would be ideal for evaluating value.
Outcomes reported by patients are incorporated into service assessments in some countries; 33 National Health Service England, for example, requires that patient-reported outcomes be assessed before and after hip and knee replacement surgery undertaken in its services. 34Our findings may not be entirely generalisable to the rest of Australia, but intervention rates during pregnancy in Queensland are similar to those in other states. 35

Conclusion
We found that the costs of maternity care have increased in Queensland, and that many adverse birth outcomes have become more frequent.Continuing cost increases of the magnitude we report are unsustainable.Broad clinical collaboration, effective prevention and treatment strategies, as well as maternal health services focused on all dimensions of value (patient and provider experience, quality of care and outcomes, efficiency, and sustainability), are needed to ensure the quality and viability of maternity care.

2 Characteristics of births in Queensland, July 2012 -June 2018
Queensland Perinatal Data Collection recorded 365 053 births during 1 July 2012 -30 June 2018.The proportion of under 20 years of age when they gave birth declined from 4.4% (1347 of 30 990 births) during the second half of 2012 to 1.8% (529 of 29 605 births) during the first half of 2018; the proportion more than 34 years old rose from 21.1% (6533 births) to 25.5% (7552 births).The proportion of women with diabetes increased from 6.4% (1988 births) to 13.1% (3885 births) (Box 1).During the same period, the proportion of iatrogenic births beyond 37 weeks' gestation increased from 40.0% to 49.6% of all births; the proportion of spontaneous vaginal births beyond 37 weeks' gestation declined from 44.0% to 36.1% (Box 2).

4 The costs and value of births in Queensland, July 2012 -June 2018
Absolute values for January-June 2018 v July-December 2012.† Actual numbers (A, B) doubled to estimate annual costs.◆ *

5 Mean costs per birth for births in Queensland, July 2012 -June 2018, by funder*
The data for this graph are included in the Supporting Information, table 1. ◆ *

6 Distribution of total costs per birth for births in Queensland, July 2012 -June 2018
232).23Physical activity interventions reduce pregnancy complication rates and that of the need for caesarean delivery (OR, 0.85; 95% CI, 0.75-0.95).23Antenatallifestyle interventions are recommended by the United States Prevention Task Force 25 and in a 2014 case for action proposal submitted to the National Health and Medical Research Council;