Table 3.

Subgroup Analyses

Category	Study Subgroup Characteristic	Number of Studies in Subgroup^*	Ratio of Relative Risks of Readmission⁺ (95% CI)	P Value for Interaction
Patient Characteristics	Patients Enrolled had CHF	16	1.02 (0.82 to 1.27)	0.83
	Patients Enrolled were Aged >65	36	0.87 (0.69 to 1.10)	0.24
	Patients Enrolled were from General Medical Ward	18	0.97 (0.78 to 1.21)	0.79
Intervention Characteristics	Intervention was Rated to Increase Capacity	16	0.76 (0.59 to 0.99)	0.04
	Intervention was Rated to Increase Workload	5^#	0.93 (0.67 to 1.29)	0.68
	Intervention was Rated to Decrease Workload	19^#	0.99 (0.78 to 1.25)	0.90
	^b Study was Published in 2001 or Later	24	1.59 (1.05 to 2.40)	0.03
	^a Two or More Individuals Delivered the Intervention	13	0.79 (0.63 to 1.00)	0.05
	^a Five or More Meaningful Patient Interactions in the Intervention	13	0.91 (0.73 to 1.14)	0.43
	^a Five or More Unique Activities in the Intervention	16	0.70 (0.56 to 0.86)	<0.01
	Intervention had Both an Inpatient and Outpatient Component	22	0.92 (0.74 to 1.15)	0.46
Outcome Characteristics	Outcome Measured was Unplanned Readmissions	9^{^}	0.95 (0.76 to 1.21)	0.70

⁺

This represents the ratio of pooled relative risks of early hospital readmission among studies that had a certain characteristic as compared to those that did not have this characteristic.

Compared to the remainder of analyzed studies (e.g. 42-N) unless otherwise noted.

Compared to “No Change,” (N=18).

^{^}

Compared to “All-Cause,” (N=30).

These cut-offs were chosen as they represented the 75^th percentile of distribution of each variable.

This cut-off was chosen as it represented the mid-point of study eligibility for this review.