. Author manuscript; available in PMC: 2023 Apr 1.

Published in final edited form as: Respir Med. 2022 Feb 18;194:106775. doi: 10.1016/j.rmed.2022.106775

Table 3:

Associations between chronotropic index obtained from 6-minute walk test (CI-6MWT) and all-cause mortality, and between heart rate recovery (HRR) and all-cause mortality. Hazard ratios represent the change in risk for a 0.1-unit change in CI-6MWT or 5 beat/minute change in HRR, and are obtained from Cox proportional hazards models.

Spirometry Group	Predictor	Adjusted Hazard Ratio¹ (95% Conf. Int.)	P-value
Total	CI-6MWT	0.998 (0.953, 1.044)	0.922
	HRR	0.99 (0.95, 1.032)	0.633
COPD	CI-6MWT	0.993 (0.942, 1.047)	0.802
	HRR	0.981 (0.934, 1.03)	0.441

CI-6MWT, chronotropic index obtained from 6-minute walk test; Conf. Int., confidence interval; COPD, chronic obstructive pulmonary disease; HRR, heart rate recovery; PRISm, preserved ratio impaired spirometry.

^1:

Models account for age, sex, race, BMI, FEV₁% predicted, current vs former smoking status and 6-minute walk test distance.