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Table 1 Characteristics of the study participants

From: Dietary supplement use in elementary school children: a Japanese web-based survey

  All children
n (%)
Grade
 1 661 (13.4)
 2 667 (13.5)
 3 832 (16.9)
 4 865 (17.5)
 5 912 (18.5)
 6 996 (20.2)
Sex
 Male 2529 (51.3)
 Female 2404 (48.7)
BMI categorya
 Underweight 713 (14.5)
 Normal-weight 3119 (63.2)
 Overweight 1101 (22.3)
Frequency of sports participation
 Never 1249 (25.3)
 Once a week 841 (17.0)
 2–3 times/week 1825 (37.0)
 4–6 times/week 623 (12.6)
 Every day 395 (8.0)
Reported health status
 Poor or fair 202 (4.1)
 Good 1287 (26.1)
 Very good 1360 (27.6)
 Excellent 2084 (42.2)
Household income (10000 Japanese yen/year)
  < 200 488 (9.9)
 200 to < 400 859 (17.4)
 400 to < 600 1443 (29.3)
 600 to < 800 1092 (22.1)
 800 to < 1000 589 (11.9)
  ≥ 1000 462 (9.4)
Maternal educational level (years)
  ≤ 12 1405 (28.5)
 13 to 15 1822 (36.9)
  ≥ 16 1706 (34.6)
  1. BMI body mass index
  2. aBMI was categorized as underweight, normal-weight, or overweight based on age- and sex-specific cut-off points defined by the International Obesity Task Force [28, 29]