Table 4.
Multivariable logistic regression analysis identifying predictors of ED assessment of self-harm, clustered by study site*
| Characteristic | Complete dataset (N=94,354) | Dataset with outlying site excluded (n=78,408) | ||
|---|---|---|---|---|
| Adjusted Risk Ratio | 95% CI | Adjusted Risk Ratio | 95% CI | |
| Weekend presentation | 1.30 | 1.04–1.62 | 1.27 | 0.86–1.88 |
| Presentation on evening/night shift (1500–0659 hours) | 1.36 | 1.01–1.85 | 0.88 | 0.63–1.22 |
| Age ≥65 years | 0.56 | 0.35–0.92 | 0.67† | 0.36–1.26 |
| Male gender | 1.17 | 1.10–1.26 | 1.14† | 1.02–1.27 |
| Interaction of age x gender | NA | 0.83† | 0.70–0.98 | |
| Race/ethnicity | ||||
| White | Referent | referent | ||
| Black or African-American | 0.89 | 0.58–1.37 | 0.63 | 0.39–1.03 |
| Asian | 0.98 | 0.70–1.43 | 0.90 | 0.67–1.23 |
| American Indian or Alaska native | 2.30 | 1.53–3.47 | 0.66 | 0.22–1.94 |
| Native Hawaiian or Pacific Islander | 0.64 | 0.21–1.95 | 0.22 | 0.02–1.77 |
| Hispanic or Latino | 2.41 | 1.67–3.48 | 0.85 | 0.70–1.03 |
| Other | 0.79 | 0.41–1.54 | 1.09 | 0.63–1.87 |
| Not documented | 1.91 | 1.21–3.02 | 0.45 | 0.20–1.02 |
*
Controlling for weekend presentation, age, sex, and race/ethnicity
†
Interpretation of the adjusted risk ratio for age and sex in the setting of an interaction requires consideration of the interaction coefficient. See text and Table 5