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Table 3 Trends of maternal age groups in pregnant women using joinpoint regression analysis from 2011 to 2019

From: The trend in delayed childbearing and its potential consequences on pregnancy outcomes: a single center 9-years retrospective cohort study in Hubei, China

Variables and segments Year APC (95% CI)
< 30 years
 Trend1 2011–2014 0.2 (−36.2, 57.5)
 Trend2 2014–2017 −8.2 (− 62.8, 126.4)
 Trend3 2017–2019 −6.6 (− 62.1, 130.3)
 AAPC (95% CI) 2011–2019 −4.7 (−11.0, 2.0)
30–34 years
 Trend1 2011–2014 −1.0 (−22.2, 25.9)
 Trend2 2014–2017 5.3 (−34.9, 70.3)
 Trend3 2017–2019 7.4 (−33.6, 73.7)
 AAPC (95% CI) 2011–2019 3.4 (−0.3, 7.2)
≥35 years (AMA)
 Trend1 2011–2014 0.4 (− 69.9, 34.5)
 Trend2 2014–2017 21.4 (− 89.1, 248.5)
 Trend3 2017–2019 −0.8 (−91.1102.0)
 AAPC (95% CI) 2011–2019 7.5 (−10.3, 28.9)
  1. APC Annual percentage change, AAPC Average annual percent change, CI Confidence interval