Table 3.

Association of predictors and number of errors and error score

	Univariable			Multivariable
Error number predictors	IRR	95% CI	P-value	IRR	95% CI	P-value
Group:
Intervention (ref)	–
Control	3.94	2.44 to 6.36	<0.001	4.88	3.35 to 7.13	<0.001
Sex:
Female (ref)	–
Male	1.19	0.80 to 1.78	0.39	1.20	0.79 to 1.82	0.39
Age	1.02	1.00 to 1.05	0.083	0.99	0.97 to 1.02	0.63
Medical card status:
Yes (ref)	–
No	0.96	0.64 to 1.45	0.85	0.92	0.64 to 1.31	0.63
Number of medications on admission	1.06	1.02 to 1.10	0.003	1.09	1.05 to 1.14	<0.001
Functional status:
Not independent (ref)	–
Independent	0.84	0.57 to 1.23	0.38	1.08	0.77 to 1.53	0.65
Length of stay	1.02	1.00 to 1.03	0.10	1.00	0.98 to 1.02	0.94

	Univariable			Multivariable
Error score predictors	IRR	95% CI	P-value	IRR	95% CI	P-value
Group:
Intervention (ref)	–
Control	4.30	2.55 to 7.25	<0.001	5.71	3.66 to 8.91	<0.001
Sex:
Female (ref)	–
Male	1.44	0.90 to 2.29	0.13	1.36	0.86 to 2.17	0.19
Age	1.02	0.99 to 1.05	0.31	0.99	0.96 to 1.01	0.31
Medical card status:
Yes (ref)	–
No	0.77	0.49 to 1.21	0.26	0.74	0.49 to 1.12	0.15
Number of medications on admission	1.05	1.00 to 1.10	0.07	1.09	1.04 to 1.14	<0.001
Functional status:
Not independent (ref)	–
Independent	0.98	0.63 to 1.54	0.94	1.16	0.75 to 1.77	0.51
Length of stay	1.00	0.99 to 1.02	0.69	0.99	0.98 to 1.01	0.32

CI = confidence interval. IRR = incidence rate ratio. Ref = reference.