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Effect duration [h] of the preceding MPH medication and Ritalin® LA, as assessed by parents at the baseline and the final visit, respectively
| Preceding MPH | Ritalin® LA | P* | |
|---|---|---|---|
| All changing patients | 6.2 ± 2.0 (147) | 7.3 ± 1.4 (224) | <0.001 |
| Subgroups changing for | |||
| Poor effectiveness | 6.1 ± 2.0 (87) | 7.5 ± 1.4 (103) | <0.001 |
| Other reasons | 6.5 ± 2.0 (60) | 7.0 ± 1.4 (119) | 0.037 |
| P** | 0.139 | 0.023 | |
Values are mean ± standard deviation (number of patients with data)
* Wilcoxon; ** Mann–Whitney test
