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Table 2 Mean number of steps per day (with 95 % CI) among boys and girls by grade level in Tokyo in 2011

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

    Total Boys Girls Differences of steps per day between boys and girls   
Grade Age n Mean steps per day 95 % CI n Mean steps per day 95 % CI n Mean steps per day 95 % CI p value d
All grades    15471 10338 10281–10395 7786 11262 11173–11351 7685 9402 9336–9468 1860 <0.001 0.513
Primary school 1 6–7 1564 11659 11504–11813 802 12575 12369–12781 762 10694 10482–10906 1881 <0.001 0.602
2 7–8 1548 11641 11475–11806 772 12714 12491–12936 776 10573 10352–10795 2141 <0.001 0.644
3 8–9 1565 11573 11406–11740 768 12736 12512–12961 797 10452 10232–10673 2284 <0.001 0.677
4 9–10 1615 11336 11169–11503 828 12596 12381–12811 787 10010 9790–10231 2586 <0.001 0.758
5 10–11 1591 10908 10740–11077 795 12302 12085–12519 796 9517 9300–9734 2785 <0.001 0.815
6 11–12 1656 10612 10444–10781 853 12021 11807–12234 803 9117 8896–9337 2904 <0.001 0.831
Junior high school 1 12–13 1715 9674 9497–9850 877 10218 9974–10462 838 9104 8855–9353 1114 <0.001 0.299
2 13–14 1529 9273 9092–9455 783 9830 9580–10080 746 8689 8433–8946 1141 <0.001 0.316
3 14–15 1632 7887 7743–8031 816 8337 8136–8538 816 7437 7236–7638 900 <0.001 0.304
High school 1 15–16 374 8485 8147–8824 177 8583 8091–9075 197 8398 7932–8864 185 0.592  
2 16–17 374 8152 7828–8477 161 8322 7827–8816 213 8025 7595–8454 297 0.373  
3 17–18 308 8032 7692–8373 154 7935 7452–8417 154 8130 7647–8612 −195 0.574  
(subclassification)
Primary school 1–3 6–9 4677 11624 11530–11718 2342 12674 12542–12806 2335 10571 10439–10703 2103 <0.001 0.642
4–6 9–12 4862 10950 10853–11047 2476 12303 12175–12432 2386 9545 9414–9676 2758 <0.001 0.798
1–6 6–12 9539 11280 11212–11348 4818 12483 12382–12584 4721 10053 9977–10129 2430 <0.001 0.718
Junior high school 1–3 12–15 4876 8950 8851–9049 2476 9476 9347–9604 2400 8408 8278–8539 1068 <0.001 0.302
High school 1–3 15–18 1056 8235 8042–8428 492 8294 8007–8582 564 8184 7915–8452 110 0.575  
  1. Differences between boys and girls tested with independent t-tests and Cohen’s ds were calculated to assess the size of intergroup differences