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