Table 5.

Predictors associated with pDDIs.

Variable	Total number of patients: n = 2342		Multivariate
Interaction present (n = 2145)	Interaction absent (n = 197)	OR (95% Cl)	P-value
Patient age (years)
<60	1069	155
>60	1076	42	0.243 (0.167–0.353)	<0.001
Gender
Female	965	86
Male	1180	111	0.857 (0.616–1.193)	0.361
Hospital stay (days)
<7	1359	168
>7	786	29	0.230 (0.150–0.354)	<0.001
Number of drugs
<7	564	162
>7	1581	35	0.063 (0.043–0.093)	<0.001

OR = Odds ratio; CI = Confidence interval.

Exposure to potential drug–drug interactions (pDDIs) was the dependent variable in the model (0 = absent, 1 = present). The following variables were included in the model as predictors of pDDIs: patient’s age (1 = below 60 years, 0 = 60 years or older), gender (1 = male, 0 = female), hospital stay (1 = less than 7 days, 0 = 7 days or above), and number of drugs (1 = less than 7 drugs, 2 = 7 or above).

p = < 0.001 was considered statistically significant.