Table 1.
Characteristics of Korean adolescents. Data are presented as n (%).
| Characteristics | Males (n = 38,221) |
Females (n = 35,965) |
Total (n =74,186) |
p value | |
|---|---|---|---|---|---|
| School Grade | Middle school | 19,283 (50.5) | 18,014 (50.1) | 37,297 (50.3) | .322 |
| High school | 18,938 (49.5) | 17,951 (49.9) | 36,889 (49.7) | ||
| Current smoking | Nonsmoking | 32,059 (83.9) | 33,735 (93.8) | 65,749 (88.8) | <.001 |
| Smoking | 6,152 (16.1) | 2,230 (6.2) | 8,382 (11.2) | ||
| Current alcohol consumption | Nondrinking | 28,620 (74.9) | 29,311 (81.5) | 57,931 (78.2) | <.001 |
| Drinking | 9,591 (25.1) | 6,654 (18.5) | 16,255 (21.8) | ||
| Grade point average | High | 4,547 (11.9) | 3,373 (9.4) | 7,920 (10.7) | <.001 |
| High middle | 8,943 (23.4) | 8,659 (24.1) | 17,602 (23.7) | ||
| Middle | 9,949 (26.0) | 9,905 (27.5) | 19,854 (26.8) | ||
| Low middle | 9,481 (24.8) | 9,460 (26.3) | 18,941 (25.5) | ||
| Low | 5,301 (13.9) | 4,568 (12.7) | 9,869 (13.3) | ||
| Family socio-economic status | High | 3,085 (8.1) | 1,698 (4.7) | 4,783 (6.4) | <.001 |
| High middle | 9,498 (24.9) | 8,001 (22.2) | 17,499 (23.6) | ||
| Middle | 17,185 (45.0) | 17,699 (49.2) | 4,884 (47.0) | ||
| Low middle | 6,407 (16.8) | 6,806 (18.9) | 13,213 (17.8) | ||
| Low | 2,046 (5.4) | 1,761 (4.9) | 3,807 (5.1) | ||
| Depression | No | 28,499 (74.6) | 22,942 (63.8) | 51,441 (69.3) | <.001 |
| Yes | 9,722 (25.4) | 13,023 (36.2) | 22,745 (30.7) | ||
| Stress | Very much | 3,478 (9.1) | 5,325 (14.8) | 8,814 (11.9) | <.001 |
| Some what | 9,853 (25.8) | 12,699 (35.3) | 22,552 (30.4) | ||
| Moderate | 16,638 (43.5) | 13,764 (38.3) | 30,402 (41.0) | ||
| Very little | 6,768 (17.7) | 3,723 (10.4) | 10,491 (14.1) | ||
| Not at all | 1,475 (3.9) | 452 (1.3) | 1,927 (2.6) | ||
| Self-rated health | Very good | 9,617 (25.2) | 4,909 (13.6) | 14,526 (19.6) | <.001 |
| Good | 18,384 (48.1) | 17,251 (48.0) | 35,635 (48.0) | ||
| Fair | 8,119 (21.2) | 10,640 (29.6) | 18,759 (25.3) | ||
| Poor | 1,952 (5.1) | 3,031 (8.4) | 4,983 (6.7) | ||
| Very poor | 149 (0.4) | 134 (0.4) | 283 (0.4) |