Table 3.
12-months (min/day) | 18-months (min/day) | 3.5-years (min/day) | |
---|---|---|---|
12-months (min/day) | – | 0.78** | 0.31* |
Correlations between visits | |||
18-months (min/day) | – | – | 0.33* |
Concurrent usage | |||
All sample | |||
Median cut-off | 10 | 15 | 15 |
Sample mean (SD) | 25.58 (54.94) | 29.14 (62.28) | 37.93 (62.92) |
LU | |||
N | 21 | 23 | 19 |
Mean (SD) | 0.52 (1.25) | 2.09 (3.23) | 3.16 (4.15) |
HU | |||
N | 32 | 26 | 27 |
Mean (SD) | 42.03 (66.01) | 53.08 (78.54) | 62.41 (73.03) |
*p < .05, **p < .001 for the Spearman’s rho correlation.