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Table 1 The variables showed normal distribution in Japanese schoolchildren in 1999 and 2009 (n = 233)

From: Decline in objective physical activity over a 10-year period in a Japanese elementary school

  1999 2009 P value of two-way ANOVA
  Boys Girls Boys Girls
   Mean (SD) Median (5th and 95th percentiles) Mean (SD) Median (5th and 95th percentiles) Mean (SD) Median (5th and 95th percentiles) Mean (SD) Median (5th and 95th percentiles) Year Sex Y × S
  n = 62 n = 63 n = 56 n = 52  
Physical characteristics
 Height cm 145.8 (6.5) 145.1 (136.5–157.5) 147.1 (6.6) 148.0 (135.1–157.1) 147.8 (7.6) 148.4 (134.6–161.5) 150.1 (6.0) 149.8 (141.6–160.5) 0.005 0.044 0.615
Accelerometer output
 PAL 1.92 (0.16) 1.89 (1.71–2.16) 1.85 (0.20) 1.83 (1.64–2.11) 1.72 (0.08) 1.72 (1.57–1.86) 1.73 (0.08) 1.73 (1.61–1.85) <0.001 0.095 0.046
Time spent performing specific activities
 Walking to school min 41 (24) 38 (9–93) 46 (27) 40 (5–98) 35 (20) 34 (5–70) 39 (22) 40 (8–73) 0.043 0.202 0.954
 Watching TV min 108 (61) 105 (13–229) 98 (61) 96 (3–211) 90 (57) 84 (1–198) 111 (84) 92 (8–254) 0.775 0.549 0.088
 Sleeping min 515 (48) 523 (427–583) 502 (42) 510 (427–570) 500 (41) 503 (421–568) 490 (50) 498 (392–574) 0.029 0.069 0.790
 Bedtime h:m 22:30 (51') 22:20 (21:00–00:01) 22:42 (44') 22:43 (21:28–00:00) 22:36 (42') 22:28 (21:37-23:36) 22:47 (51') 22:48 (21:18–00:17) 0.435 0.070 0.985
  1. PAL physical activity level; Significance was set at P < 0.05