Table 3.

Univariate analyses of association between candidate strain variables and perceived strain scores^*

Variable	Charge Nurse			Arbitrator
	β Coefficient	95% CI	P Value	β Coefficient	95% CI	P Value
MICU census	0.10	0.03, 0.16	0.004	0.11	0.04, 0.17	0.001
Mean APACHE III score	0.01	−0.00, 0.02	0.094	0.00	−0.01, 0.01	0.396
MICU admissions	0.01	−0.08, 0.10	0.813	0.07	−0.02, 0.17	0.106
Nonmedical discharges	0.03	−0.46, 0.52	0.891	0.48	0.01, 0.95	0.046
Transfers accepted	−0.08	−0.31, 0.15	0.502	0.06	−0.17, 0.28	0.623
Transfers accepted and admitted	−0.21	−0.62, 0.20	0.308	−0.15	−0.52, 0.22	0.419
Transfers accepted but unable to admit	−0.02	−0.23, 0.19	0.845	0.08	−0.13, 0.29	0.439
Medical ward census	0.00	−0.02, 0.02	0.979	−0.01	−0.03, 0.01	0.343
Nonmedical ward census	0.01	−0.03, 0.04	0.746	−0.01	−0.04, 0.02	0.585
Emergency department census	−0.01	−0.04, 0.01	0.311	0.00	−0.03, 0.02	0.910
Transition unit census	0.00	−0.04, 0.04	0.893	0.00	−0.05, 0.04	0.833
Other ICU census	−0.01	−0.04, 0.03	0.614	0.02	−0.02, 0.06	0.255

Definition of abbreviations: APACHE = Acute Physiology and Chronic Health Evaluation; CI = confidence interval; ICU = intensive care unit; MICU = medical ICU.

^*Perceived strain scores were standardized by respondent to account for nonhomogeneous variability in scores given by individuals. Because the perceived strain score is subjective and standardized, the β coefficients and 95% confidence intervals cannot be easily interpreted quantitatively, but are provided to give some measure of the magnitude of the effect.