Table 5.

Summary of stepwise linear regression models for predicting spirometry adherence (days with performed spirometry) with the clinical, anthropometric, and spirometry data.

Model 1 Age, BMI, AS, VS, BS, FEV1%pv
AIC:	101.00
Variables:	Coefficient (95%CI)	p-value
Intercept	14.69 (−15.64–45.03)	0.3628
BMI	−0.73 (−1.71–0.26)	0.1744
FEV1%pv	0.234 (0.039–0.430)	0.0387
Model 2: age, BMI, AS, VS, BS, FVC%pv
AIC:	102.19
Variables	Coefficient (95%CI)	p-value
Intercept	24.71 (−2.81–52.22)	0.1062
BMI	−1.45 (−2.17–−0.13)	0.0494
FVC%pv	0.2226 (0.0090–0.4362)	0.0659

BMI, body mass index; AS, ambulatory status: non-ambulatory = 0, ambulatory = 1; BS, Brooke scale; VS, Vignos scale; BS, VS are described in Section 2.5; FVC, forced vital capacity; FEV1, forced expiratory volume in 1 s.