Table 2.
Distribution of demographic characteristics, socioeconomic status, oral health behavior, and dietary habits of children according to blood lead level quartiles
| Total (n = 137) |
Quartile I (n = 35) |
Quartile II (n = 34) |
Quartile III (n = 34) |
Quartile IV (n = 34) |
|
|---|---|---|---|---|---|
| No. (%) | No. (%) | No. (%) | No. (%) | No. (%) | |
| Age (years, mean ± SD) | 10.9 ± 2.1 | 12.4 ± 1.7 | 11.1 ± 2.1 | 10.2 ± 1.9 | 9.8 ± 1.8 |
| Gender | |||||
| Male | 68 (49.6) | 12 (34.3) | 17 (50.0) | 19 (55.9) | 20 (58.8) |
| Female | 69 (50.4) | 23 (65.7) | 17 (50.0) | 15 (44.1) | 14 (41.2) |
| Family income (10,000 won/month)a | |||||
| < 200 | 17 (12.8) | 4 (11.4) | 8 (24.2) | 1 (2.9) | 4 (12.9) |
| 200-399 | 47 (35.3) | 14 (40.0) | 11 (33.3) | 14 (41.2) | 8 (25.8) |
| 400-599 | 46 (34.6) | 9 (25.7) | 12 (36.4) | 11 (32.4) | 14 (45.2) |
| > 600 | 23 (17.3) | 8 (22.9) | 2 (6.1) | 8 (23.5) | 5 (16.1) |
| Parent’s educationa | |||||
| ≤ High school | 61 (44.9) | 11(31.4) | 19 (55.9) | 11 (33.3) | 20 (58.8) |
| College/university | 70 (51.5) | 24 () | 13 (38.2) | 19 (57.6) | 14 (41.2) |
| Graduate school | 5 (3.7) | – | 2 (5.9) | 3 (9.1) | – |
| Father’s occupation | |||||
| Profession | 50 (36.5) | 10 (28.6) | 12 (35.3) | 13 (38.2) | 15 (44.1) |
| White collar/Service | 45 (32.8) | 15 (42.9) | 8 (23.5) | 10 (29.4) | 12 (35.3) |
| Blue collar | 34 (24.8) | 8 (22.9) | 11 (32.4) | 10 (29.4) | 5 (14.7) |
| Unemployed | 8 (5.8) | 2 (5.7) | 3 (8.8) | 1 (2.9) | 2 (5.9) |
| Mother’s occupation | |||||
| Profession | 24 (17.5) | 6 (17.1) | 3 (8.8) | 10 (29.4) | 5 (14.7) |
| White collar/Service | 39 (28.5) | 10 (28.6) | 8 (23.5) | 9 (26.5) | 12 (35.3) |
| Blue collar | 11 (8.0) | 1 (2.9) | 6 (17.6) | 2 (5.9) | 2 (5.9) |
| Unemployed | 63 (46.0) | 18 (51.4) | 17(50.0) | 13 (38.2) | 15 (44.1) |
| Frequency of tooth cleaning | |||||
| ≤ Once a day | 3 (2.2) | – | 1 (0.7) | 2 (5.9) | – |
| 2-3 times/day | 101 (73.7) | 25 (71.4) | 24 (17.5) | 27 (79.4) | 25 (73.5) |
| > 4 times/day | 33 (24.1) | 10 (28.6) | 9 (26.5) | 5 (14.7) | 9 (26.5) |
| Sugar-containing sweets intake | |||||
| < Once a day | 23 (16.8) | 5 (14.3) | 5 (14.7) | 7 (20.6) | 6 (17.6) |
| Once a day | 71 (51.8) | 18 (51.4) | 22 (64.7) | 16 (47.1) | 15 (44.1) |
| 2-3 times/day | 43 (31.4) | 12 (34.3) | 7 (20.6) | 11 (32.4) | 13 (38.2) |
| Dental treatment demand (1 year) | |||||
| Yes | 80 (58.8) | 20 (57.1) | 21 (61.8) | 17 (50.0) | 22 (66.7) |
| No | 56 (41.2) | 15 (42.9) | 13 (38.2) | 17 (50.0) | 11 (33.3) |
aSome answers were missing