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Distracted driving score and subscore reliability and correlation to reported crashes (N = 228)
| Cronbach’s Alpha (standardized) | Spearman correlation coefficient (test-retest)* | Correlation to crash rate: odds ratio per point increase | Correlation to crash rate: 95 % confidence interval | Correlation to crash rate: p values | |
|---|---|---|---|---|---|
| DDS | 0.93 | 0.82 | 1.07 | 1.03–1.12 | p = 0.0005 |
| DDS-reading | 0.85 | 0.82 | 1.13 | 1.05–1.21 | p = 0.001 |
| DDS-writing | 0.86 | 0.63 | 1.17 | 1.06–1.29 | p = 0.0015 |
* Boston cohort only (N=56)
