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Table 3 Distribution and CI of history of pregnancy and delivery outcomes among Chinese women in 2006 and 2008-2009

From: Equity in use of maternal health services in Western Rural China: a survey from Shaanxi province

Gravidity and outcomes Year Income level,% Total CI a(95% confidence interval)
   Poorest 2nd Middle 4th Richest   
Number of pregnancies ≥3 2006 14.4 11.7 16.7 10.6 10.1 12.6 −0.0706(−0.1695, 0.0282)
2008 19.4 25.7 15.3 17.3 20.7 19.4 −0.0075(−0.0915, 0.0764)
Number of children ≥2 2006 51.7 49.4 45.0 35 24.6 40.6 −0.1340(−0.1796, −0.0885)*
2008 57.0 37.2 42.6 40.6 34.8 41.8 −0.0728(−0.1075, −0.0381)*
Birth weight <2500 g 2006 5.0 7.2 3.3 5.0 3.4 4.6 0.0975(−0.0737, 0.2687)
2008 2.8 1.7 4.1 2.7 1.7 2.8 0.1554(−0.0324, 0.3433)
Gestational weeks ≥37 2006 85.6 86.1 88.9 83.3 87.2 86.4 −0.0013(−.0165, 0.0138)
2008 94.5 91.7 97.2 95.8 95.4 94.6 0.0061(−0.0076, 0.0199)
  1. CI aconcentration index.
  2. *P < 0.05, for t-test comparison with CI = 0. A negative value of the CI was expected to indicate a higher rate among the poorer people.