Table 5.
Reliability and hypotheses testing for construct validity of the RCADS-25 and RCADS-20 subscales
| RCADS-25 | RCADS-20a | ||||
|---|---|---|---|---|---|
| Broad anxiety | MDD-10 | MDD-5 | |||
| Reliability | |||||
| Internal consistency | (N = 69,487) | Cronbach’s alpha | 0.82 | n.a.b | 0.72 |
| Test-retest reliabilityc | (N = 277) | ICC (95% CI) | 0.73 (0.66–0.78) | 0.70 (0.62–0.76) | 0.60 (0.52–0.67) |
| Hypotheses testing | |||||
| Hypotheses about correlation SCARED-NL | (N = 269) | r (95% CI) | 0.84 (0.80–0.87) | 0.68 (0.61–0.74) | 0.66 (0.58–0.72) |
| Hypotheses about correlation CDI-2 | (N = 276) | r (95% CI) | 0.66 (0.59–0.72) | 0.66 (0.58–0.72) | 0.59 (0.51–0.67) |
RCADS Revised Child Anxiety and Depression Scale, MDD Major depressive disorder, n.a Not applicable, ICC Intraclass correlation coefficient, SCARED-NL Screen for Child Anxiety Related Emotional Disorders-Dutch version, CDI-2 Children’s Depression Inventory-second version
a The broad anxiety scale of the RCADS-20 is equal to the broad anxiety scale of the RCADS-25
b Cronbach’s alpha was not calculated for the RCADS-25 MDD-10 scale, since the data did not fit a one-factor model, and unidimensionality is a prerequisite for its interpretation