Comparison of general characteristics between complete cases and cases with missing data
| Complete case (n=884) | Missing case* (n=206) | P value† | Missing case‡ (n=420) | P value§ | |
| Age (year), mean±SD | 14.7 (1.9) | 14.9 (2.0) | 0.13 | 14.8 (2.0) | 0.19 |
| Residence | <0.01 | 0.28 | |||
| Capital | 191 (21.6) | 68 (33.0) | 93 (22.1) | ||
| Metropolitan | 179 (20.3) | 42 (20.4) | 100 (23.8) | ||
| Town/city | 514 (58.1) | 96 (46.6) | 227 (54.1) | ||
| Household income | <0.01 | 0.56 | |||
| Lowest third | 103 (11.9) | 54 (27.1) | 41 (9.9) | ||
| Middle third | 487 (56.1) | 99 (49.8) | 240 (57.7) | ||
| Highest third | 278 (32.0) | 46 (23.1) | 135 (32.5) | ||
| Birth weight, mean±SD | 3.2 (0.5) | 3.0 (0.8) | 0.33 | 3.3 (0.5) | 0.07 |
| Obesity | |||||
| Overweight¶ | 117 (13.2) | 9 (10.3) | 0.57 | 45 (10.7) | 0.20 |
| General obesity** | 114 (12.9) | 10 (11.5) | 0.66 | 57 (13.6) | 0.74 |
| Body composition | |||||
| BMI (kg/m2), mean±SD | 20.9 (3.6) | 20.4 (3.5) | 0.13 | 21.0 (3.7) | 0.72 |
| Fat mass index (kg/m2), mean±SD | 5.8 (2.5) | 5.3 (2.5) | 0.15 | ||
| Lean mass index (kg/m2), mean±SD | 15.0 (2.1) | 15.2 (2.3) | 0.36 |
Data presented in number (percentage) with appropriate units unless otherwise stated.
*Cases with missing values on birth weight or BMI (cases removed from obesity analysis).
†P value of the difference between complete case and missing case.
‡Cases with missing values on DXA (Dual energy X-ray Absorptiometry) (cases removed from body composition analysis).
§P value of the difference between complete case and missing case.
¶Overweight: BMI ≥85 percentile BMI of age and sex or 23 kg/m2, but not obesity.
**General obesity (Korean criteria): BMI ≥95 percentile BMI of age and sex or 25 kg/m2.
BMI, body mass index.