Statistical justification for aggregation of scale scores to a composite score
| SAQ scales | ICC(1) | ICC(2) | ANOVA p value | Median of Rwg(j) |
|---|---|---|---|---|
| Teamwork climate | 0.08 | 0.90 | <0.01 | 0.84 |
| Safety climate | 0.07 | 0.89 | <0.01 | 0.88 |
| Job satisfaction | 0.06 | 0.88 | <0.01 | 0.87 |
| Stress recognition | 0.02 | 0.69 | 0.06 | 0.64 |
| Perception of management | 0.11 | 0.93 | <0.01 | 0.74 |
| Working conditions | 0.06 | 0.86 | <0.01 | 0.77 |
| Expected range to justify aggregation | 0.05–0.3 | >0.7 | <0.05 | >0.7 |
ICC(1), proportion of total variance explained by NICU membership. ICC(2), overall estimate of the reliability of NICU means. One-way ANOVA indicates that responses differ between NICUs. Rwg(j) is the within-NICU inter-rater agreement index.
ANOVA, analysis of variance; ICC, intraclass correlation coefficient; NICU, neonatal intensive care unit; SAQ, Safety Attitudes Questionnaire.