Table 3.

Relationship Between the Number of Cardiac Rehabilitation Sessions Attended and Long-Term Outcomes by Subgroup

Indication and No. of Sessions Attended	HR (95% CI)*
	Mortality	Myocardial Infarction
Indication, CABG
36 sessions vs 24 sessions	0.99 (0.85–1.16)	0.90 (0.83–0.98)
36 sessions vs 12 sessions	0.81 (0.71–0.92)	0.81 (0.69–0.96)
36 sessions vs 1 session	0.61 (0.52–0.71)	0.74 (0.58–0.95)
Indication, Myocardial infarction
36 sessions vs 24 sessions	0.66 (0.52–0.84)	0.89 (0.80–0.99)
36 sessions vs 12 sessions	0.72 (0.59–0.88)	0.79 (0.64–0.97)
36 sessions vs 1 session	0.46 (0.36–0.57)	0.71 (0.52–0.96)
Indication, Stable angina
36 sessions vs 24 sessions	0.84 (0.62–1.15)	0.79 (0.69–0.91)
36 sessions vs 12 sessions	0.88 (0.68–1.15)	0.63 (0.47–0.83)
36 sessions vs 1 session	0.50 (0.38–0.66)	0.50 (0.33–0.76)
Heart failure
36 sessions vs 24 sessions	0.88 (0.76–1.03)	0.91 (0.83–0.98)
36 sessions vs 12 sessions	0.81 (0.71–0.92)	0.82 (0.70–0.97)
36 sessions vs 1 session	0.54 (0.47–0.63)	0.75 (0.59–0.95)
Attended 6 or more sessions
36 sessions vs 24 sessions	0.86 (0.76–0.97)	0.88 (0.82–0.95)
36 sessions vs 12 sessions	0.75 (0.68–0.83)	0.78 (0.67–0.91)
36 sessions vs 1 session	—	—

Abbreviations: CABG, coronary artery bypass graft surgery; CI, confidence interval; HR, hazard ratio.

^*Estimates from the mortality model are based on a nonlinear spline function; estimates from the myocardial infarction model are based on a linear function. Both models controlled for demographic characteristics, comorbid conditions, and subsequent hospitalization.