In Table 5 of the above, the entry in the last cell of the Olanzapine row should read 13. The corrected table appears below.
TabLE 5 Numbers needed to treat (NNT) for all-cause discontinuation for the Tiihonen studya

| Comparator | |||||||
|---|---|---|---|---|---|---|---|
| Clozapine | Olanzapine | Perphenazine | Risperidone | Haloperidol | Depot perphenazine | ||
| Primary | Clozapine | 6 | 2 | 4 | 2 | 15 | |
| Olanzapine | −6 | 2 | 8 | 2 | 13 | ||
| Perphenazine | −2 | −2 | −4 | 5 | −2 | ||
| Risperidone | −4 | −8 | 4 | 2 | −4 | ||
| Haloperidol | −2 | −2 | −5 | −2 | −2 | ||
| Perphenazine depot | −15 | −13 | 2 | 4 | 2 | ||

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