Table 2

Changes in the mean age at menarche, the mean length of full-term gestation and accumulated duration of breastfeeding in women from Eastern China
age group age at menarche(year) Times of full-term gestations Accumulative breastfeeding period (months)
number mean ± SD P value* number mean ± SD P value* number mean ± SD P value*
25-34 27217 14.65 ± 1.57 27226 1.01 ± 0.48 26749 13.62 ± 9.80
35-44 40812 15.12 ± 1.76 40832 1.35 ± 0.57 39823 18.99 ± 13.85
45-54 27079 15.68 ± 2.12 <0.001 27092 1.67 ± 0.78 <0.001 26518 24.86 ± 21.35 <0.001
55-64 19631 16.26 ± 2.30 19641 2.20 ± 1.00 19252 32.39 ± 28.62
65-70 7105 16.20 ± 2.36 7105 3.06 ± 1.53 6953 43.51 ± 39.50
total 121844 15.39 ± 2.02 121896 1.58 ± 0.94 119295 22.68 ± 21.78
loss value 214 162 2763

*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