Table 4.

Mortality risk estimates in the four groups adjusted by confounders

Adjusted risk compared to G1	HR adjusted (95% CI)	P-value
G4: <350 m and delta <30 m	3.28 (2.02–5.33)	<0.0001
G3: <350 m and delta ≥30 m	1.90 (1.28–2.84)	0.0016
G2: ≥350 m and delta <30 m	1.36 (0.92–2.00)	0.1144

Notes: G1, Group 1: 6MWDi ≥350 m and Δ6MWD ≥30 m; G2, Group 2: 6MWDi ≥350 m and Δ6MWD <30 m; G3, Group 3: 6MWDi <350 m and Δ6MWD ≥30 m; G4, Group 4: 6MWDi <350 m and Δ6MWD <30 m. Bold font denotes statistical significance (P<0.05).

Abbreviations: 6MWD, 6-minute walk distance; 6MWDi, initial 6MWD; CI, confidence interval; HR, hazard ratio.