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 | ||||||