Table 3 Trends in age-standardized prevalence (95 % confidence intervals) of childhood obesity according to household income and urbanity among South Korean boys and girls aged 10–19

Boys

Girls

IOTF criteria

3.4 (2.5–4.3)

4.8 (3.5–6.1)

0.0751

IOTF criteria

1.3 (0.7–1.8)

2.7 (1.6–3.9)

0.0141

Household income

Household income

 Low

3.2 (1.7–4.7)

4.1 (2.3–5.9)

0.4392

0.4249

 Low

2.1 (0.9–3.4)

3.6 (1.5–5.6)

0.211

0.8101

 Middle

3.3 (1.9–4.8)

3.7 (1.5–5.8)

0.8356

 Middle

0.8 (0.1–1.5)

2.0 (0.2–3.7)

0.2291

 High

3.5 (1.9–5.1)

6.5 (3.8–9.2)

0.0435

 High

1.1 (0.1–2.0)

2.2 (0.6–3.8)

0.1393

 P-value for trend***

0.9189

0.1771

 P-value for trend***

0.1519

0.245

Urbanity

Urbanity

 Rural

3.8 (1.8–5.7)

1.9 (0.2–3.6)

0.171

0.0117

 Rural

2.6 (1.0–4.3)

8.1 (2.7–13.5)

0.1346

0.3353

 Urban

3.3 (2.3–4.3)

5.4 (3.8–6.9)

0.0205

 Urban

1.0 (0.4–1.5)

2.1 (1.1–3.1)

0.0536

 P-value****

0.6957

0.0197

 P-value****

0.0342

0.0387

KCDC 2007

5.2 (4.0–6.4)

6.9 (5.3–8.5)

0.1427

KCDC 2007

5.9 (4.5–7.2)

7.8 (6.0–9.6)

0.101

Household income

Household income

 Low

4.3 (2.5–6.0)

6.4 (3.8–8.9)

0.2611

0.6890

 Low

8.6 (5.6–11.5)

9.3 (6.3–12.3)

0.7375

0.9588

 Middle

4.9 (3.0–6.7)

5.4 (2.9–7.9)

0.8176

 Middle

3.7 (2.1–5.4)

6.2 (3.3–9.1)

0.1703

 High

6.2 (3.8–8.6)

8.7 (5.6–11.9)

0.2113

 High

5.6 (3.5–7.7)

7.3 (4.3–10.2)

0.3357

 P-value for trend***

0.2758

0.2521

 P-value for trend***

0.1134

0.2516

Urbanity

Urbanity

 Rural

5.7 (3.3–8.1)

3.9 (1.2–6.7)

0.2371

0.0356

 Rural

7.1 (4.5–9.7)

13.5 (7.2–19.8)

0.1686

0.3428

 Urban

5.1 (3.8–6.4)

7.4 (5.6–9.2)

0.0526

 Urban

5.6 (4.1–7.2)

7.2 (5.4–9.0)

0.2448

 P-value****

0.6814

0.0484

 P-value****

0.4082

0.1444