Table 1.
General characteristics of participants in the baseline survey
| Characteristics | n (%) | |
|---|---|---|
| Gender | Male | 240 (51.8) |
| Female | 223 (48.2) | |
| Monthly income (million won per month) | <2 | 126 (27.2) |
| 2–3 | 102 (22.0) | |
| >3 | 127 (37.4) | |
| Educational level of father | ≤High school | 148 (32.0) |
| >High school | 202 (43.6) | |
| Educational level of mother | ≤High school | 350 (43.4) |
| >High school | 175 (31.3) | |
| Job of father | Unemployed | 11 (2.4) |
| Manual worker | 113 (24.4) | |
| Non-manual worker | 211 (45.6) | |
| Job of mother | Unemployed | 173 (37.4) |
| Manual worker | 25 (5.4) | |
| Non-manual worker | 145 (31.3) | |
| Frequency of brushing per day | ≤1 | 32 (6.9) |
| 2 | 189 (40.8) | |
| ≥3 | 152 (32.8) | |
| Visited a dentist within the previous 6 months | No | 141 (30.5) |
| Yes | 221 (47.7) | |
| Frequency of chewing gum per week | Hardly ever | 220 (47.5) |
| More than once | 141 (30.5) | |
| Frequency of fish intake per week | Hardly ever | 65 (9.5) |
| 1–2 | 266 (39.1) | |
| ≥3 | 63 (9.3) | |