Table 1.

Power and sample size scenarios

	Conservative		Ambitious
Control group readmission rate*	13.52%	13.52%	13.52%	13.52%
Intervention group readmission rate	9.60%	9.10%	10.20%	9.70%
Power	80%	90%	80%	90%
Detectable difference	3.9%	4.4%	3.3%	3.8%
Projected study sample size	1117	1117	1582	1582

Two-group X² test of equal proportions (equal n’s), two-sided test, final analysis α=0.048.

*Historical Vanderbilt University Medical Center readmission rates.