表 1.
不同特征人群初潮年龄分布情况(n=58 114)
Distribution of age at menarche in different population groups (n=58 114)
| Characteristic | Total, n(%) | Age at menarche | P value | |
| Mean±SD | M (P25, P75) | |||
| Birth cohort | < 0.001 | |||
| 1951-1959 | 7 247 (12.47) | 16.23±1.93 | 16.00 (15.00, 18.00) | |
| 1960-1969 | 20 766 (35.73) | 15.56±1.55 | 15.00 (15.00, 16.00) | |
| 1970-1979 | 17 365 (29.88) | 14.89±1.34 | 15.00 (14.00, 16.00) | |
| 1980-1989 | 8 245 (14.19) | 14.43±1.28 | 15.00 (14.00, 15.00) | |
| 1990-1998 | 4 491 (7.73) | 14.05±1.25 | 14.00 (13.00, 15.00) | |
| Region | < 0.001 | |||
| Urban | 40 598 (69.86) | 15.10±1.57 | 15.00 (14.00, 16.00) | |
| Rural | 17 516 (30.14) | 15.34±1.70 | 15.00 (14.00, 16.00) | |
| Educational level | < 0.001 | |||
| Primary school or below | 17 559 (30.21) | 15.75±1.72 | 15.00 (15.00, 17.00) | |
| Junior high school | 24 094 (41.46) | 15.18±1.49 | 15.00 (14.00, 16.00) | |
| Senior high school | 8 432 (14.51) | 14.80±1.47 | 15.00 (14.00, 16.00) | |
| College or above | 7 973 (13.72) | 14.24±1.31 | 14.00 (13.00, 15.00) | |
| Unknown | 56 (0.10) | 14.68±1.16 | 15.00 (14.00, 15.00) | |