TABLE 1.
Demographics of Chilean girls in the Growth and Obesity Cohort Study who were included in the prospective analysis of diet, breast composition, and age at menarche (2006–2016)
| Outcome cohort |
||
| Breast composition (n = 290 girls) | Age at menarche (n = 324 girls) | |
| Age at breast stage 4 visit, y | 11.4 (10.8, 12.0)1 | — |
| Fibroglandular volume | ||
| % | 38.3 (27.6, 53.7) | — |
| cm3 | 76.8 (58.6, 97.6) | — |
| Breast stage 4 visit | ||
| Weight, kg | 43.3 (38.4, 48.4) | — |
| Height, cm | 149.0 (144.7, 153.7) | — |
| BMI-for-age z score | 0.7 (−0.1, 1.2) | — |
| Girls with menarche, n (%) | — | 294 (90.7) |
| Age at menarche, y | — | 11.9 (11.4, 12.5) |
| Weight before menarche,2 kg | — | 43.1 (38.4, 48.9) |
| Height before menarche, cm | — | 148.7 (144.3, 152.9) |
| BMI-for-age z score before menarche | — | 0.7 (−0.1, 1.2) |
| Mother | ||
| BMI, kg/m2 | 27.5 (24.7, 31.2) | 27.4 (24.6, 31.1) |
| Highest education, n (%) | ||
| Primary school | 46 (15.9) | 50 (15.4) |
| High school | 217 (74.8) | 246 (75.9) |
| University or above | 14 (5.2) | 14 (4.3) |
| Missing | 13 (4.1) | 14 (4.3) |
| Age at menarche, y, n (%) | ||
| ≤11 | — | 51 (15.7) |
| 12 | — | 79 (40.1) |
| 13 | — | 76 (24.4) |
| ≥14 | — | 84 (25.9) |
| Missing | — | 34 (10.5) |
| Television watching after school in childhood, n (%) | ||
| No | 17 (5.9) | 17 (5.2) |
| Sometimes | 13 (4.5) | 14 (4.3) |
| Yes | 248 (85.5) | 280 (86.4) |
| Missing | 12 (4.1) | 13 (4.0) |
| Eating while watching television in childhood, n (%) | ||
| No | 14 (4.8) | 19 (5.9) |
| Sometimes | 132 (45.5) | 142 (43.8) |
| Yes | 131 (45.2) | 149 (46.0) |
| Missing | 13 (4.5) | 14 (4.3) |
| 24-h recalls, n (%) | ||
| 1 | 123 (42.4) | 150 (46.3) |
| 2 | 54 (18.6) | 68 (21.0) |
| 3 | 59 (20.3) | 59 (18.2) |
| 4–6 | 54 (18.6) | 47 (14.5) |
| Intake | ||
| Calories, kcal/d | 1877 (1548, 2237) | 1862 (1537, 2228) |
| From fat, % | 29.6 (25.3, 33.4) | 29.2 (25.1, 32.9) |
| From protein, % | 13.8 (11.8, 15.6) | 13.9 (11.9, 15.9) |
| From carbohydrates, % | 57.8 (54.1, 62.2) | 58.2 (54.2, 62.3) |
| Dairy, g/d | 258 (150, 275) | 261 (146, 375) |
| Meat, g/d | 73.6 (50.0, 111.1) | 73.2 (49.6, 112.0) |
| Sugar-sweetened beverages, mL/d | 284 (188, 429) | 291 (185, 422) |
1
Median; 25th–75th percentiles in parentheses (all such values).
2
Median time between weight and height assessment and menarche was 194 d.