Table 2.

Risk factors associated with Drug-Drug interactions

#	Variable	Total No. patients	Patients with DDI	Adjusted Odds ratio (95% confidence interval)	P-value
1	All	1510	126
2	Age
	60-69 yrs	937	67	1 (reference)
	70-79 yrs	414	29	0.99 (0.61-1.57)	0.009
	80 yrs or more	159	30	3.04 (1.84-4.94)	0.00
3	Sex
	Men	943	84	1 (reference)
	Women	567	42	0.82 (0.55-1.22)	0.30
4	No. of medication
	Less than 6	340	11	1 (reference)
	6-10	587	36	1.9 (0.94-4.14)	0.05
	11 or more	583	79	4.5 (2.38-9.47)	0.00
5	Length of stay
	Less than 10 days	1162	95	1 (reference)
	10-19 days	309	28	1.13 (0.7-1.78)	0.61
	20 days or more	39	3	1.07 (0.23-3.25)	0.91
6	Num. of Diagnosis
	Single	292	11	1 (reference)
	Double	427	38	2.42 (1.2-5.28)	0.007
	Multiple	791	77	2.66 (1.40-5.57)	0.001
Adjusted for confounders like age, sex, number of medications, co-morbid conditions and length of stay