Skip to main content

Table 5 The trend of SRB in the subgroup of material education at the three stages of Two-Child Policy (22 Hospitals in Hebei Province of China, 2013–2017)

From: How does the two-child policy affect the sex ratio at birth in China? A cross-sectional study

SRB in subgroup

BTCP

OTCP

UTCP

P

College and above (SRB)

1.041

1.032

1.024

0.30

Middle school (SRB)

1.096

1.058 b1

1.058 b2

< 0.01

Primary school and below (SRB)

1.137

1.070

1.062

0.27

Unadjusted OR (95% CI)

 College and above

1.00

0.99(0.95–1.03)

0.98(0.95–1.02)

0.58

 Middle school

1.00

0.96(0.94–0.99)

0.96(0.94–0.99)

< 0.01

 Primary school and below

1.00

0.94(0.83–1.07)

0.93(0.82–1.06)

0.49

Adjusted OR (95% CI)

 College and above

1.00

0.99(0.96–1.03)

0.98(0.95–1.01)

0.46

 Middle school

1.00

0.96(0.93–0.98)

0.95(0.93–0.98)

< 0.01

 Primary school and below

1.00

0.90(0.79–1.03)

0.90(0.79–1.03)

0.21

  1. BTCP: Both the husband and wife of one couple were the only child of their parents, the couple were allowed to have Two Children in Policy (January 1, 2013 - May 29, 2014); OTCP: only the husband or wife of one couple was the only child of their parents, the couple were allowed to have Two Children in Policy (May 30, 2014 - December 31, 2015); UTCP: the Universal Two-Child Policy, every couple were allowed to have two children (January 1, 2016 - December 31, 2017). SRB: Sex Ratio at Birth (n (male) / n (female)); OR Odds Ratio; 95% CI: 95% Confidence Intervals
  2. A chi-square test was used in the SRB at the three Two-Child Policy stages. BTCP acted as a control, univariate logistic regression was used to examine the strength of association between the SRB and the Two-Child Policy, and was showed in Unadjusted OR (95% CI); After adjusting the factors such as maternal age, delivery mode, parity, delivery hospital, multivariate logistic regression analysis was used, and was showed in Adjusted OR (95% CI)
  3. b1Statistically significant when BTCP compared to OTCP;
  4. b2Statistically significant when BTCP compared to UTCP