Table 4.
Trends in age-standardized prevalence (95 % confidence intervals) of childhood overweight according to household income and urbanity among South Korean boys and girls aged 10–19
| 1998–2001 | 2010–2012 | P for trends* | P for interaction** | 1998–2001 | 2010–2012 | P for trends* | P for interaction** | ||
|---|---|---|---|---|---|---|---|---|---|
| Boys | Girls | ||||||||
| IOTF criteria | 20.4 (18.3–22.5) | 25.6 (22.9–28.3) | 0.0027 | IOTF criteria | 15.0 (13.1–17.0) | 16.7 (14.3–19.1) | 0.3184 | ||
| Household income | Household income | ||||||||
| Low | 16.4 (13.0–19.7) | 23.7 (19.3–28.1) | 0.0145 | 0.9315 | Low | 18.7 (14.9–22.6) | 19.8 (15.7–23.9) | 0.6558 | 0.9977 |
| Middle | 21.7 (18.0–25.3) | 24.4 (19.9–28.9) | 0.4186 | Middle | 13.5 (10.4–16.6) | 15.8 (11.5–20.1) | 0.6519 | ||
| High | 22.2 (18.5–25.9) | 29.4 (24.7–34.1) | 0.0208 | High | 13.3 (10.3–16.2) | 13.9 (9.9–17.9) | 0.8108 | ||
| P-value for trend*** | 0.0263 | 0.0701 | P-value for trend*** | 0.0434 | 0.0355 | ||||
| Urbanity | Urbanity | ||||||||
| Rural | 15.9 (12.1–19.7) | 20.1 (14.5–25.8) | 0.2276 | 0.7877 | Rural | 14.4 (10.9–17.9) | 21.7 (14.6–28.8) | 0.1915 | 0.2495 |
| Urban | 21.4 (19.0–23.8) | 26.7 (23.8–29.6) | 0.0061 | Urban | 15.1 (12.9–17.3) | 16.3 (13.7–18.9) | 0.6156 | ||
| P-value**** | 0.0186 | 0.0743 | P-value**** | 0.7173 | 0.3666 | ||||
| KCDC 2007 | 15.2 (13.3–17.2) | 18.5 (16.1–20.9) | 0.0514 | KCDC 2007 | 16.9 (14.9–18.9) | 18.2 (15.7–20.8) | 0.4672 | ||
| Household income | Household income | ||||||||
| Low | 13.7 (10.6–16.9) | 17.4 (13.4–21.4) | 0.2613 | 0.4813 | Low | 21.4 (17.5–25.4) | 20.9 (16.7–25.1) | 0.9034 | 0.6819 |
| Middle | 14.8 (11.6–18.0) | 15.6 (11.7–19.5) | 0.7925 | Middle | 15.9 (12.6–19.2) | 18.3 (13.6–22.9) | 0.6741 | ||
| High | 16.7 (13.3–20.1) | 22.9 (18.5–27.3) | 0.0345 | High | 13.8 (10.7–16.8) | 14.9 (10.8–19.0) | 0.6374 | ||
| P-value for trend*** | 0.2927 | 0.0687 | P-value for trend*** | 0.005 | 0.0493 | ||||
| Urbanity | Urbanity | ||||||||
| Rural | 12.1 (8.6–15.6) | 13.8 (8.7–18.8) | 0.6597 | 0.5495 | Rural | 17.5 (13.6–21.3) | 24.5 (17.3–31.7) | 0.301 | 0.3593 |
| Urban | 15.9 (13.7–18.1) | 19.4 (16.7–22.0) | 0.0571 | Urban | 16.8 (14.5–19.0) | 17.6 (14.9–20.3) | 0.7501 | ||
| P-value**** | 0.0619 | 0.0673 | P-value**** | 0.7772 | 0.2463 | ||||
*P-values for time trends between 1998–2001 and 2010–2012
**P-values for the interactions between time period and household income and between time period and urbanity
***P-values for linear trends among household income groups
****P-values for between-group (urban-rural areas) differences