(b).
| Average monthly use | ||||||
| Mean ± SD | 12.9 ± 12.5 | 8.8 ± 12.4 | 8.0 ± 11.0 | 13.1 ± 13.5 | 9.5 ± 13.1 | 12.0 ± 11.9 |
| p = 0.14 | p = 0.062 | p = 0.37 | ||||
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