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Table 1 Changes in Maternal demographics from 2005–2017

From: Impact of childbirth policy changes on obstetric workload over a 13-year period in a regional referral center in China – implications on service provision planning

Year Total births (n = 49,479) Multiparas (%) Age ≥ 35 years (%) High BMIa (%) ART pregnancy (%) Tertiary education(%)
2005 1941 10.6 6.5 5.4(78/1453) 0.2 22.9(443/1932)
2006 2278 13.6 7.7 6.9(121/1751) 0.2 43.7(996/2278)
2007 3011 10.1 7.9 6.7(173/2565) 0.1 40.5(1209/2983)
2008 2968 12.4 8.9 5.6(151/2687) 0.4 37.2(1102/2960)
2009 2806 12.2 9.7 5.8(161/2781) 0.4 40.1(1123/2799)
2010 2900 13.7 11.3 6.7(193/2884) 0.6 43.9(1268/2891)
2011 3267 15.8 12.0 7.5(244/3246) 0.7 45.3(1481/3267)
2012 4140 16.1 10.7 6.9(286/4118) 0.5 48.4(2005/4140)
2013 4000 20.5 13.1 8.7(347/3983) 0.6 49.8(1991/4000)
2014 5096 22.6 12.4 9.1(463/5085) 0.3 55.5(2829/5094)
2015 4595 32.8 16.5 10.3(473/4578) 0.5 57.1(2617/4581)
2016 6700 35.2 17.2 10.8(721/6700) 1.3 61.0(4085/6700)
2017 5777 50.8 24.3 12.5(721/5749) 2.10 78.2(4516/5777)
Difference P < 0.001 P < 0.001 P < 0.001 P < 0.001 P < 0.001 P < 0.001
Correlation P < 0.001 P < 0.001 P < 0.001 P < 0.001 P < 0.001 P < 0.001
  1. Results expressed in % unless specified, comparison of difference by χ2 test, correlation analysis by Spearman’s test; BMI body mass index, ART assisted reproduction technology
  2. aMissing = 1899; bMissing = 77