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Table 1 Distribution of participants by valid days of pedometer wear, grade, and sex in Tokyo in 2011

From: Pedometer-determined physical activity among youth in the Tokyo Metropolitan area: a cross-sectional study

     Number of students per valid days of pedometer wear
    Total 1 day 2 days 3 days 4 days 5 days 6 days 7 days
  Grade Age n Pct n Pct n Pct n Pct n Pct n Pct n Pct n Pct
Boys
Primary school All grades   7786 100 245 3.1 344 4.4 490 6.3 830 10.7 1220 15.7 1572 20.2 3085 39.6
1 6–7 802 100 22 2.7 38 4.7 48 6.0 74 9.2 117 14.6 182 22.7 321 40.0
2 7–8 772 100 30 3.9 37 4.8 55 7.1 76 9.8 115 14.9 179 23.2 280 36.3
3 8–9 768 100 33 4.3 46 6.0 52 6.8 92 12.0 106 13.8 168 21.9 271 35.3
4 9–10 828 100 33 4.0 33 4.0 47 5.7 84 10.1 132 15.9 173 20.9 326 39.4
5 10–11 795 100 22 2.8 35 4.4 41 5.2 77 9.7 136 17.1 155 19.5 329 41.4
6 11–12 853 100 27 3.2 29 3.4 45 5.3 77 9.0 123 14.4 181 21.2 371 43.5
Junior high school 1 12–13 877 100 34 3.9 40 4.6 70 8.0 119 13.6 151 17.2 174 19.8 289 33.0
2 13–14 783 100 16 2.0 33 4.2 59 7.5 106 13.5 131 16.7 146 18.6 292 37.3
3 14–15 816 100 23 2.8 38 4.7 52 6.4 79 9.7 128 15.7 138 16.9 358 43.9
High school 1 15–16 177 100 3 1.7 9 5.1 13 7.3 15 8.5 34 19.2 16 9.0 87 49.2
2 16–17 161 100 0 0.0 4 2.5 3 1.9 21 13.0 21 13.0 30 18.5 82 50.9
3 17–18 154 100 2 1.3 2 1.3 5 3.2 10 6.5 26 16.9 30 19.5 79 51.3
Girls
Primary school All grades   7685 100 124 1.6 232 3.0 357 4.6 627 8.2 949 12.3 1575 20.5 3821 49.7
1 6–7 762 100 18 2.4 26 3.4 47 6.2 78 10.2 88 11.5 160 21.0 345 45.3
2 7–8 776 100 12 1.5 31 4.0 37 4.8 83 10.7 92 11.9 144 18.6 377 48.6
3 8–9 797 100 18 2.3 33 4.1 36 4.5 60 7.5 88 11.0 181 22.7 381 47.8
4 9–10 787 100 12 1.5 22 2.8 39 5.0 68 8.6 97 12.3 162 20.6 387 49.2
5 10–11 796 100 11 1.4 20 2.5 22 2.8 47 5.9 76 9.5 166 20.9 454 57.0
6 11–12 803 100 10 1.2 14 1.7 34 4.2 50 6.2 91 11.3 146 18.2 458 57.0
Junior high school 1 12–13 838 100 12 1.4 24 2.9 53 6.3 73 8.7 134 16.0 184 22.0 358 42.7
2 13–14 746 100 11 1.5 16 2.1 36 4.8 70 9.4 81 10.9 158 21.2 374 50.1
3 14–15 816 100 13 1.6 31 3.8 33 4.0 58 7.1 108 13.2 166 20.3 407 49.9
High school 1 15–16 197 100 5 2.5 7 3.6 8 4.1 20 10.2 33 16.8 39 19.8 85 43.1
2 16–17 213 100 1 0.5 6 2.8 5 2.3 14 6.6 38 17.8 42 19.7 107 50.2
3 17–18 154 100 1 0.6 2 1.3 7 4.5 6 3.9 23 14.9 27 17.5 88 57.1