Table 1 Age of Thai girls at menarche by year of birth
Year of birth | Age (years)a | Number of students | Mean (range) | 95%CI | |
|---|---|---|---|---|---|
Total | Number undergoing menarche n (%) | ||||
1997 | 16 | 56 | 54 (96.4) | 12.6 (9.8–15.0) | 12.3–12.9 |
1998 | 15 | 71 | 67 (94.4) | 12.5 (8.6–14.4) | 12.2–12.8 |
1999 | 14 | 93 | 79 (84.9) | 12.1 (10.0–13.9) | 11.9–12.3 |
2000 | 13 | 222 | 165 (74.3) | 11.8 (8.2–13.5) | 11.7–11.9 |
2001 | 12 | 259 | 124 (47.9) | 11.3 (9.7–12.9) | 11.2–11.4 |
2002 | 11 | 235 | 46 (19.6) | 10.8 (9.0–11.7) | 10.6–11.0 |
2003 | 10 | 84 | 2 (2.4) | 9.5 (9.0–10.0) | NAb |
Total | 1,020 | 537 (52.6) | 11.8 (8.2–15.0) | 11.7–11.9 | |