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Table 2 Results from the lifestyle questionnaire in 1998 and 2008

From: Comparative survey of go/no-go results to identify the inhibitory control ability change of Japanese children

  G-1 G-2 G-3
  1998 2008 t p 1998 2008 t p 1998 2008 t p
Awake time 7:07 7:11 -0.632 NS 7:16 6:54 2.587 * 7:14 7:05 1.653 NS
Bedtime 21:12 21:01 0.943 NS 21:08 20:49 1.873 NS 21:09 20:36 1.194 NS
Time to play (min) 215 182 1.912 NS 227 186 3.187 ** 201 155 2.790 **
Time to study (min) - - - - - - - - - - - -
Time to watch TV & play videogame 94 114 -1.203 NS 101 101 0.022 NS 79 87 -0.487 NS
  G-4 G-5 G-6
  1998 2008 t p 1998 2008 t p 1998 2008 t p
Awake time 6:35 6:19 3.455 *** 6:30 6:17 0.126 NS 6:44 6:22 -1.223 NS
Bedtime 20:56 21:01 0.102 NS 20:54 21:18 -3.491 *** 21:10 21:12 1.453 NS
Time to play (min) 95 71 2.025 * 87 73 1.156 NS 100 91 -1.210 NS
Time to study (min) 80 46 -0.138 NS 115 57 2.519 * 114 71 -0.648 NS
Time to watch TV & play videogame 86 83 2.077 * 133 98 3.194 ** 124 174 -0.871 NS
  G-7 G-8 G-9
  1998 2008 t p 1998 2008 t p 1998 2008 t p
Awake time 6:32 6:20 0.987 NS 6:32 6:19 -1.408 NS 6:28 6:19 1.776 NS
Bedtime 21:10 21:32 0.958 NS 21:17 22:08 -2.626 ** 21:32 21:56 -0.398 NS
Time to play (min) 75 75 -0.120 NS 85 63 0.690 NS 60 53 0.954 NS
Time to study (min) 158 89 0.544 NS 113 98 -1.498 NS 183 111 0.974 NS
Time to watch TV & play videogame 110 132 0.395 NS 125 114 1.283 NS 93 106 2.334 *
  G-10 G-11 G-12
  1998 2008 t p 1998 2008 t p 1998 2008 t p
Awake time 5:45 5:56 -1.336 NS 5:54 5:57 -1.427 NS 5:50 6:17 -2.593 *
Bedtime 23:02 22:29 2.790 ** 23:18 23:17 0.054 NS 23:39 23:57 -1.227 NS
Time to play (min) 27 45 -1.982 NS 67 111 -2.658 ** 27 132 -2.922 **
Time to study (min) 127 119 0.592 NS 105 113 -0.554 NS 218 158 4.168 ***
Time to watch TV & play videogame (min) 99 95 0.246 NS 117 166 -1.460 NS 61 97 -2.804 **
  1. NS, not significant; *p < 0.05; **p < 0.01; ***p < 0.001.