Table 5.

Multiple binary logistic regression model for factors associated with potential drug-drug interactions among 502 patients admitted to surgery wards in 3 Palestinian hospitals.

Predictor variable		β coefficient of predictor variables	Standard error	Wald	P value	Odds ratio (95% CI)
Age (years)	20-39			0.89	0.83	Reference
	40-59	0.00	0.25	0.00	0.99	1.00 (0.617-1.631)
	60-79	-0.24	0.30	0.62	0.43	0.79 (0.43-1.43)
	≥80	-0.20	0.49	0.17	0.68	0.82 (0.31-2.14)
Number of prescribed drugs	2-4			96.78	0.00	Reference
	5-7	1.31	0.29	21.13	0.00	3.70 (2.12-6.47)
	8-10	2.49	0.34	53.30	0.00	12.03 (6.17-23.46)
	≥11	4.12	0.47	75.91	0.00	61.40 (24.32-155.02)
Hospitalization period (days)	1-3			2.99	0.23	Reference
	4-6	0.33	0.25	1.74	0.19	1.39 (0.85-2.26)
	≥7	0.43	0.27	2.57	0.11	1.54 (0.91-2.63)