Table 2 |
|
| Distribution of selected characteristics in 315 mother-child pairs, OMCHS, Japan | |
| Variable | Number (%) |
| Baseline characteristics | |
| Maternal age (years) | |
| < 29 | 91 (28.9) |
| 29-31 | 106 (33.7) |
| ≥ 32 | 118 (37.5) |
| Gestational age at baseline (weeks) | |
| < 15 | 111 (35.2) |
| 15-20 | 94 (29.8) |
| ≥ 21 | 110 (34.9) |
| Family income (yen/year) | |
| < 4,000,000 | 75 (23.8) |
| 4,000,000-5,999,999 | 129 (41.0) |
| ≥ 6,000,000 | 111 (35.2) |
| Maternal education (years) | |
| < 13 | 69 (21.9) |
| 13-14 | 136 (43.2) |
| ≥ 15 | 110 (34.9) |
| Paternal education (years) | |
| < 13 | 102 (32.4) |
| 13-14 | 55 (17.5) |
| ≥ 15 | 158 (50.2) |
| Maternal smoking during pregnancy | 43 (13.7) |
| Characteristics at follow-up surveys | |
| Child’s gender (male) | 174 (55.2) |
| Breastfeeding duration (months) | |
| < 12 | 151 (47.9) |
| ≥ 12 | 164 (52.1) |
| Age at introduction to solid foods (months) | |
| < 6 | 177 (56.2) |
| ≥ 6 | 138 (43.8) |
| Age at first tooth eruption (months) | |
| < 7 | 157 (49.8) |
| ≥ 7 | 158 (50.2) |
| Toothbrushing frequency in children at fourth survey (times/day) | |
| < 2 | 202 (64.1) |
| ≥ 2 | 113 (35.9) |
| Toothbrushing frequency in children at fifth survey (times/day) | |
| < 2 | 168 (53.3) |
| ≥ 2 | 147 (46.7) |
| Use of fluoride | |
| No | 55 (17.5) |
| Yes | 260 (82.5) |
| Regular dental check-ups | 127 (40.3) |
| Household smoking at fifth survey | 117 (37.1) |
| Age at oral examination (months) | |
| < 43 | 190 (60.3) |
| ≥ 43 | 125 (39.7) |
| Children’s dairy products intake at fifth survey (times/week) | 12.3 (8.6) |
Tanaka et al. Nutrition Journal 2012 11:33 doi:10.1186/1475-2891-11-33
