Table 3

Changes in mean age at first birth, the frequency of miscarriage and mean age at menopause in women from Eastern China
age group Age at first birth (years) Times of miscarriage Age at menopause
number mean ± SD P value* number mean ± SD P value* number mean ± SD P value*
25-34 27226 22.38 ± 7.73 27164 0.29 ± 0.65
35-44 40832 24.36 ± 3.54 40777 0.42 ± 0.77
45-54 27092 24.39 ± 2.94 <0.001 27065 0.45 ± 0.83 <0.001 9955 47.92 ± 4.60
55-64 19641 23.95 ± 3.50 19626 0.27 ± 0.65 18118 49.28 ± 4.29 <0.001
65-70 7105 23.04 ± 4.00 7098 0.22 ± 0.61 6724 48.71 ± 4.62
total 121896 23.75 ± 4.80 121730 0.36 ± 0.74 34797 48.63 ± 4.82
loss value 162 328 1506

*Statistical analysis was performed using ANOVA

Zhang et al.

Zhang et al. BMC Public Health 2012 12:368   doi:10.1186/1471-2458-12-368

Open Data