Table 2.

Independent predictors of physical activity parameters (daily steps, sedentary time, and time in MVPA) in 40 IPF patients at baseline

Variables	Steps per day		Sedentary time (mins/day)		Time in MVPA (mins/day)
	β (95% CI)	p	β (95% CI)	p	(β 95% CI)	p
GAP: stage III	–	–	− 27.9 (− 52.6, − 3.2)	0.028	–	–
6MWD (m)	13.7 (4, 23.5)	0.007	–	–	–	–
MIP (%pred.)	–	–	− 0.89 (− 1.3, − 0.47)	< 0.001	0.88 (0.47,1.3)	< 0.001
QMVC (%pred.)	41.7 (7.2, 76.2)	0.019	− 0.57 (− 1.02, − 0.11)	0.016	0.69 (0.23, 1.14)	0.004
BMI: ≥ 25 (kg/m2)	–	–	24.5 (0.32, 48.7)	0.047	–	–
HADS score (depression)	− 214.6 (− 416.6, − 12.5)	0.038	–	–	–	–
Adjusted R2	0.455		0.561		0.470

GAP index was dichotomized to GAP I-II and GAP III. BMI was dichotomized by BMI < 25 and ≥ 25

Each column is a single multivariate lineal regression model including as covariates the variables that show a coefficient in each column. Degree of dyspnoea, FVC %pred., Total SGRQ score and HAD anxiety score, were tested as potential predictors, and finally not included because they were not independently related to the outcome, nor modified estimates for the remaining variables

MVPA Moderate to vigorous physical activity; 6MWD Six-minute walked distance; QMVC Quadriceps maximum voluntary contraction; HADS Hospital anxiety and depression scale; GAP Gender-age-physiology; MIP Maximum inspiratory pressure; BMI Body mass index