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Interscale correlation matrices* for VAS/Likert-type methods
| Effectiveness (EFFECT) | Side effects (SIDEF) | Convenience (CONV) | ||||
| VAS** | Likert*** | VAS** | Likert*** | VAS** | Likert*** | |
| Effectiveness | 1.00 | 1.00 | ||||
| Side effects | .23 | .37 | 1.00 | 1.00 | ||
| Convenience | .22 | .36 | .33 | .35 | 1.00 | 1.00 |
| Global Satisfaction | .60 | .72 | .36 | .43 | .41 | .48 |
* Spearman correlations are significant at the .0001 level (2-tailed); **VAS sample (n = 287); ***Likert type sample (n = 280)
