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.

Tanaka et al. Nutrition Journal 2012 11:33   doi:10.1186/1475-2891-11-33

Open Data