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Table 1 Descriptive characteristics of the study population and times spent in sedentary behaviors

From: School grade and sex differences in domain-specific sedentary behaviors among Japanese elementary school children: a cross-sectional study

  Number Percent
Overall 625 100.0
Okayama in 2010 303 48.5
Tokyo in 2014 322 51.5
Sex
 Male 330 52.8
 Female 295 47.2
Grade level
 Lower grades 173 27.7
 Higher grades 452 72.3
Body mass index (kg/m2)
 Mean ± SD 16.9 ± 2.7
 Z score (median, 25 to 75%ile) −0.19, −0.65 to 0.40
Sedentary time, min/week
 Weekdays Mean ± SD
  Reading or listening to music 90.3 ± 123.4
  TV or video viewing 535.0 ± 356.6
  TV game use 167.3 ± 222.1
  Computer use excluding class 23.9 ± 70.9
  Doing homework or assignments 264.9 ± 185.3
  Car travel 33.4 ± 61.2
 Weekends Mean ± SD
  Reading or listening to music 42.1 ± 70.0
  TV or video viewing 323.9 ± 232.0
  TV game use 123.0 ± 96.4
  Computer use excluding class 15.8 ± 49.9
  Doing homework or assignments 74.4 ± 96.4
  Car travel 71.3 ± 84.9
Physical activitya, number of days/week
 Mean ± SD 3.0 ± 2.2
 Z score (median, 25 to 75 percent tile) −0.12, −0.82 to 0.77
  1. SD standard deviation
  2. aMVPA for at least 60 min