Table 1 Descriptive characteristics (numbers and percentages)
Variables | n | % |
|---|---|---|
Overall | 283 | 100.0 |
Sex | ||
Boys | 127 | 44.9 |
Girls | 156 | 55.1 |
Age, group | ||
6 years | 18 | 6.4 |
7 years | 61 | 21.6 |
8 years | 69 | 24.4 |
9 years | 49 | 17.3 |
10 years | 38 | 13.4 |
11 years | 29 | 10.2 |
12 years | 19 | 6.7 |
Mean ± S.D. | 8.7 ± 1.7 | |
BMI percentile for age and sex | ||
Underweight (< 5th %ile) | 21 | 7.4 |
Normal BMI (5th - 85th %ile) | 233 | 82.3 |
Overweight or obese (≥ 85th %ile) | 29 | 10.2 |
Household income level | ||
< 3,000,000 yen | 3 | 1.1 |
< 5,000,000 yen | 26 | 9.2 |
< 7,000,000 yen | 41 | 14.5 |
< 10,000,000 yen | 95 | 33.6 |
≥ 10,000,000 yen | 118 | 41.7 |
Employment status, employed | ||
Mother | 79 | 66.1 |
Father | 280 | 99.3 |
Screen time-weekday, min/day, Mean ± S.D. | ||
Children | 112.5 ± 92.1 | |
Mothers | 148.1 ± 112.4 | |
Fathers | 123.1 ± 86.6 | |
Screen time-weekend, min/day, Mean ± S.D. | ||
Children | 155.4 ± 102.1 | |
Mothers | 167.5 ± 108.3 | |
Fathers | 212.9 ± 134.8 | |