Figure 1
Mean ± SD of height, weight and BMI of 316 boys
| Age(year) | Number | Height (cm) | Weight (kg) | BMI(kg/m2) |
|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | ||
| 8–8.9 | 30 | 129.0 ± 5.1 | 30.5 ± 8.4 | 18.2 ± 4.2 |
| 9–9.9 | 42 | 133.3 ± 6.7 | 34.4 ± 9.5 | 19.2 ± 4.5 |
| 10–10.9 | 41 | 138.1 ± 8.0 | 36.8 ± 9.9 | 19.1 ± 3.9 |
| 11–11.9 | 62 | 148.6 ± 6.8 | 44.2 ± 11.0 | 19.8 ± 3.9 |
| 12–12.9 | 39 | 151.8 ± 8.9 | 48.5 ± 15.5 | 20.6 ± 5.0 |
| 13–13.9 | 58 | 158.7 ± 8.8 | 49.6 ± 13.6 | 19.4 ± 4.0 |
| 14–14.9 | 35 | 165.3 ± 7.9 | 55.3 ± 16.4 | 20.0 ± 5.0 |
| 15–15.9 | 9 | 167.3 ± 4.3 | 53.1 ± 4.3 | 19.0 ± 1.6 |
| Total | 316 | 148.0 ± 14.1 | 43.6 ± 14.4 | 19.5 ± 4.3 |
Ages at 5 genital (G) stages in 316 school boys
| Tanner stage | Number | Mean ± SD | Median | Range | 95%CI of mean age (years) |
|---|---|---|---|---|---|
| (years) | (years) | (years) | |||
| G1 | 70 | 9.3 ± 0.8 | 9.3 | 8.0–11.7 | 9.1–9.5 |
| G2 | 118 | 11.3 ± 1.3 | 11.3 | 8.0–14.9 | 11.0–11.5 |
| G3 | 34 | 12.8 ± 1.1 | 12.7 | 11.3–14.6 | 12.4–13.1 |
| G4 | 77 | 13.5 ± 1.0 | 13.5 | 11.0–15.8 | 13.2–13.7 |
| G5 | 17 | 14.5 ± 0.9 | 14.9 | 11.7–15.7 | 14.1–15.0 |
| Total | 316 | 11.7 ± 2.0 | 11.7 | 8.0–15.8 | 11.5–11.9 |
Ages (years) of onset of genital (G) and pubic hair (PH) development in Thai boys, comparison between the present and previous studies
| Year | Age (y) | Number | Assessment | Mean ages (y) | Mean ages (y) |
|---|---|---|---|---|---|
| of subjects | of subjects | of puberty | of G2 | of PH2 | |
| 1997–19994 | 7–15 | 94 | Self | 11.3 ± 1.7 P > 0.999 | 12.2 ± 1.3 P = 0.0375 |
| 1997–19993 | 9–18 | 300 | Pediatrician | 11.3 ± 0.8* P > 0.999 | 12.2 ± 0.4 P < 0.001 |
| 2011 | 8–16 | 316 | Pediatrician | 11.3 ± 1.3 | 12.5 ± 1.2 |
Age at pubic hair (PH) development in 316 school boys
| Tanner stage | Number | Mean ± SD | Median | Range | 95%CI of mean |
|---|---|---|---|---|---|
| (year) | (year) | (year) | age (year) | ||
| PH1 | 166 | 10.3 ± 1.3 | 10.2 | 8.0–13.8 | 10.1–10.5 |
| PH2 | 52 | 12.5 ± 1.2 | 12.8 | 9.1–14.9 | 12.2–12.8 |
| PH3 | 47 | 13.2 ± 1.0 | 13.5 | 11.0–14.7 | 12.9–13.5 |
| PH4 | 36 | 13.8 ± 0.9 | 13.7 | 11.7–15.8 | 13.5–14.1 |
| PH5 | 15 | 14.8 ± 0.4 | 14.9 | 13.7–15.7 | 14.5–15.0 |
| Total | 316 | 11.7 ± 2.0 | 11.7 | 8.0–15.8 | 11.5–11.9 |
Tanner stage in boys (adapted from [2])
| Tanner stages | Genitalia (G) | Pubic hair (PH) |
|---|---|---|
| 1 | Preadolescent | No coarse, pigmented hair |
| 2 | Testicular size 4–9 mL, skin on scrotum thin, reddens and enlarges, earliest increased penile length and width | Minimal coarse, pigmented hair at base of penis |
| 3 | Testicular size 10–14 mL, further enlarged scrotum | More coarse and curly, begins to extend laterally |
| 4 | Testicular size 15–20 mL, further enlarged and darken scrotum, penis increases in length to 10 cm and width | Adult-like, extending across pubis but sparing medial thighs |
| 5 | Testicular 20 >size mL, adult scrotum and penile length of 15 cm | Extends to medial surface of thighs |