TABLE 2

Differences in walking distance and oxygen saturation between the two experimental conditions

Outcome	6MWT_with	6MWT_without	Mean difference	p-value
6MWT m	337.8±85.7	346.5±86.4	−9.1 (−13.9– −4.3)	0.0004
S_pO₂ nadir %	85.1±5.4	85.0±5.6	0.06 (−0.49–0.62)	0.82
S_pO₂ artefact n	17 (4–24)	11 (3–26)	0.60 (−3.76–4.96)	0.78
S_pO₂ artefact s	34 (7–113)	24 (4–62)	17.90 (−5.45–41.20)	0.13

Data are given as mean±sd or median (interquartile range). Mean differences (95% CI) between 6 MWT_with versus 6MWT_without and S_pO₂ outcomes were analysed with a linear regression model adjusting for the experimental condition, period and subject. 6MWT: 6-min walk test; 6MWT_with: assessor walking behind the patient during 6MWT; 6MWT_without: patient walking alone during 6MWT; S_pO₂: peripheral oxygen saturation.