Table 3.

Odds ratios (95% CI) for physical activity by season.

	Spring	Summer	Autumn	Winter
Steps ≥8000/day
Overall	Reference	1.11 (0.69, 1.79)	0.98 (0.57, 1.70)	0.46 (0.28, 0.77)
Age
<65 years	Reference	0.79 (0.43, 1.44)	0.73 (0.37, 1.45)	0.38 (0.20, 0.71)
≥65 years	Reference	2.00 (0.93, 4.31)	1.75 (0.67, 4.56)	0.67 (0.26, 1.74)
p for interaction		0.06	0.15	0.32
Cardiorespiratory fitness (6MWD)
<500 m	Reference	0.94 (0.48, 1.82)	1.75 (0.73, 4.20)	0.45 (0.21, 0.96)
≥500 m	Reference	1.35 (0.67, 2.74)	0.74 (0.36, 1.55)	0.58 (0.28, 1.22)
p for interaction		0.46	0.14	0.63
MVPA ≥60 min/day
Overall	Reference	1.73 (1.10, 2.71)	1.07 (0.62, 1.83)	0.52 (0.29, 0.94)
Age
<65 years	Reference	1.59 (0.91, 2.79)	1.19 (0.62, 2.27)	0.59 (0.30, 1.15)
≥65 years	Reference	2.11 (0.96, 4.61)	0.92 (0.34, 2.50)	0.29 (0.07, 1.13)
P for interaction		0.50	0.72	0.42
Cardiorespiratory fitness (6MWD)
<500 m	Reference	1.26 (0.61, 2.58)	1.24 (0.52, 2.98)	0.30 (0.10, 0.87)
≥500 m	Reference	1.97 (1.10, 3.55)	1.03 (0.52, 2.05)	0.77 (0.37, 1.61)
p for interaction		0.34	0.75	0.15

Models were adjusted for age, sex, smoking status, FEV₁% pred, any pulmonary comorbidities, and any extra-pulmonary comorbidities. Pulmonary comorbidities include chronic obstructive pulmonary disease, asthma, or interstitial lung disease, and extra-pulmonary comorbidities include cardiovascular diseases or diabetes mellitus. 6MWD, 6-min walk distance. MVPA, moderate-to-vigorous physical activity.