Table 4.
Weighted relative risk of increased body mass and height in the exposed group relative to the reference group a.
| Observed Data (N = 206,248) | Weighted Data (N = 199,952) c | Weighted IRR | |||
|---|---|---|---|---|---|
| Outcomes, N(%) b | Non-Exposed (N =165,925) |
Exposed (N = 40,323) |
Non-Exposed (N = 160,897) |
Exposed (N = 39,055) |
(95% CI), % d |
| Overweight e | 24 596 (14.82) | 6457 (16.01) | 24 128 (15.00) | 5942 (15.21) | 1.01 (0.99 to 1.04) |
| Obesity f | 10 987 (6.62) | 3041 (7.54) | 10 802 (6.71) | 2764 (7.08) | 1.05 (1.01 to 1.09) |
| −1.64 < HAZ ≤ −1.03 g | 22 313 (13.45) | 5704 (14.15) | 21 377 (13.29) | 5742 (14.70) | 1.11 (1.08 to 1.14) |
| HZA ≤ −1.64 g | 6168 (3.72) | 1679 (4.16) | 5869 (3.65) | 1717 (4.40) | 1.21 (1.14 to 1.27) |
Abbreviations: ICU, intensive care unit; IPTW, inverse probability of treatment weighting; HAZ, height-for-age z-score; IRR, incidence risk ratio. Significant differences (p < 0.001) are indicated in bold. a Anthropometric information was recorded at the age of 6–7 years. b Results are reported as n (%) unless otherwise indicated. c IPTW on the propensity score was used to balance the groups for baseline health data. Ninety covariates were used for weighting (Table 1 and Supplementary Tables S3 and S4). Individuals in the reference group were weighted using stabilized weights to produce a sample with the same distribution of covariates as the exposed group. d Calculated using modified Poisson regression. e Overweight was defined as a BMI measured after five years of age that met or exceeded the 85th percentile of the Korean National Child Growth standards [18]. f Obesity was defined as a BMI measured after five years of age that met or exceeded the 95th percentile of the Korean National Child Growth standards [18]. g The age z-score range was determined using the Korean National Child Growth standards measure [18].