Table 2.

Group Characteristics and Administration Likelihood

	Control Group	Study Group	p Value
Duration	4 mo	14 mo
No. of alerts or alerting situations	87	323
Age	66 ± 12 yr.	66 ± 14 yr.	NS*
Female (%)	84	75	NS*
CrClest average	39 ± 16 mL/min	37 ± 14 mL/min	NS*
Likelihood of patient receiving at least a single dose of the contraindicated medication (%)	89	47	< .0001

Characteristics of the control and study groups were compared using a student's t-test for continuous variables and the χ² statistic for proportions. The CrCl_est average is the average of the most recent CrCl_est at the time of each alert. The proportion of patients receiving a dose in the control and study periods was compared using a χ² test. A p value of 0.05 was chosen for statistical significance of all comparisons.

^*No significant difference between the value in the control and study groups (p > 0.05).