Table 2 General characteristics of the CHNS participants in the present study
Characteristics | Values (mean ± SD/n (%)) |
|---|---|
n | 1118 |
postmenarcheal girls during follow-up, n | 711 (63.6) |
Age at baseline a, y | 8.3 ± 1.8 |
Years of follow-up, y | 4.0 ± 1.8 |
Wave (baseline survey year) | |
1997 | 488 (43.6) |
2000 | 170 (15.2) |
2004 | 177 (15.8) |
2006 | 66 (5.9) |
2009 | 100 (8.9) |
2011 | 117 (10.5) |
Region b | |
Northeastern area | 199 (17.8) |
East coast | 210 (18.8) |
Central area | 359 (32.1) |
Western area | 350 (31.3) |
Residency | |
Urban | 343 (30.7) |
Rural | 775 (69.3) |
Ethnicity | |
Han | 950 (85.0) |
Minority | 168 (15.0) |
Maternal education level | |
Illiterate | 194 (17.4) |
Primary school | 283 (25.3) |
Middle school | 404 (36.1) |
High school | 140 (12.5) |
Technical or vocational degree | 45 (4.0) |
College degree or higher | 52 (4.7) |
Energy intake at baseline, kcal/d | 1546 ± 495 |
Protein, % of energy | 12.4 ± 3.0 |
Fat, % of energy | 28.1 ± 11.8 |
Carbohydrate, % of energy | 59.5 ± 12.3 |
Weight, kg | 25.9 ± 7.3 |
Height, cm | 127.2 ± 12.4 |
BMI Z-score at baseline c | −0.04 ± 1.22 |