| Mean ± SD or N (%) |
---|---|
Age at thelarche (year) | 11.24 ± 1.36 |
 Range (year)a | 11–15 |
Age groups at thelarche (year) | Â |
 Early thelarche (≤ 10) | 267 (27.33) |
 Normal thelarche (11–13) | 683 (69.91) |
 Late thelarche (≥ 14) | 27 (2.76) |
Age at menarche | 13.19 ± 1.44 |
 Range (year)a | 9–17 |
Age group at menarche (year) | Â |
 Early menarche (< 12) | 94 (9.62) |
 Normal menarche (12–15) | 820 (83.93) |
 Late menarche (≥ 16) | 63 (6.45) |
Ever diagnosed with precocious puberty | Â |
 No | 924 (94.58) |
 Yes | 53 (5.42) |
Regular menstrual cycle in the past 12 months | Â |
 No | 593 (60.70) |
 Yes | 384 (39.30) |
Regular menstrual periods in the past 12 months | Â |
 No | 337 (34.49) |
 Yes | 640 (65.51) |
Menstrual quantity in the past 12 months (amount of bleeding) | Â |
 Little | 225 (23.03) |
 Moderate | 609 (62.33) |
 Heavy | 105 (10.75) |
 Heavy with large clots | 38 (3.89) |
Menstrual flow length in the past 12 months (days) | 5.90 ± 1.42 |
 Range | 1–12 |
Menstrual flow length in the past 12 months (days) | Â |
 < 3 | 14 (1.43) |
 3–7 | 912 (93.35) |
 > 7 | 51 (5.22) |