Group | M(SD) | Comparison group | Mean difference | S.E | p |
---|---|---|---|---|---|
Less than 15Â min | 13.674 (11.849) | Â | Â | Â | Â |
 | 15–29 min | -1.321 | 0.930 | 0.487 | |
 | 30–59 min | -2.279* | 0.794 | 0.022 | |
 | 1 h or more | -4.987* | 0.746 |  < 0.0001 | |
15–29 min | 14.995 (12.104) |  |  |  |  |
 | Less than 15 min | 1.321 | 0.930 | 0.487 | |
 | 30–59 min | -0.958 | 0.886 | 0.701 | |
 | 1 h or more | -3.666* | 0.843 |  < 0.0001 | |
30–59 min | 15.953 (13.250) |  |  |  |  |
 | Less than 15 min | 2.279* | 0.794 | 0.022 | |
 | 15–29 min | 0.958 | 0.886 | 0.701 | |
 | 1 h or more | -2.708* | 0.691 | 0.001 | |
1Â h or more | 18.661 (15.848) | Â | Â | Â | Â |
 | Less than 15 min | 4.987* | 0.746 |  < 0.0001 | |
 | 15–29 min | 3.666* | 0.843 |  < 0.0001 | |
 | 30–59 min | 2.708* | 0.691 | 0.001 |