Group | M(SD) | Comparison group | Mean difference | S.E | p |
---|---|---|---|---|---|
Less than 15Â min | 2.297 (0.412) | Â | Â | Â | Â |
 | 15–29 min | -0.137* | 0.026 |  < 0.0001 | |
 | 30–59 min | -0.143* | 0.021 |  < 0.0001 | |
 | 1 h or more | -0.203* | 0.020 |  < 0.0001 | |
15–29 min | 2.434 (0.367) |  |  |  |  |
 | Less than 15 min | 0.137* | 0.026 |  < 0.0001 | |
 | 30–59 min | -0.006 | 0.024 | 0.995 | |
 | 1 h or more | -0.066* | 0.023 | 0.023 | |
30–59 min | 2.440 (0.392) |  |  |  |  |
 | Less than 15 min | 0.143* | 0.021 |  < 0.0001 | |
 | 15–29 min | 0.006 | 0.024 | 0.995 | |
 | 1 h or more | -0.060* | 0.018 | 0.006 | |
1Â h or more | 2.500 (0.394) | Â | Â | Â | Â |
 | Less than 15 min | 0.203* | 0.020 |  < 0.0001 | |
 | 15–29 min | 0.066* | 0.023 | 0.023 | |
 | 30–59 min | 0.060* | 0.018 | 0.006 |