Spring, summer, and fall

Winter

p-value

Male

N

371

159

Age (years)

68.4 ± 7.3

68.5 ± 6.3

0.85

Height (cm)

166.9 ± 6.1

166.7 ± 5.3

0.62

Weight (kg)

65.6 ± 9.2

65.3 ± 8.6

0.73

BMI (kg/m2)

23.5 ± 2.8

23.5 ± 2.6

0.92

FVC (L)

3.64 ± 0.70

3.51 ± 0.63

<0.05

FEV1 (L)

2.64 ± 0.64

2.50 ± 0.61

<0.05

FEV1/FVC (%)

72.3 ± 10.0

70.9 ± 10.8

0.15

predFVC (%)

96.4 ± 16.6

93.7 ± 15.6

0.08

predFEV1 (%)

101.3 ± 22.0

96.3 ± 21.9

<0.05

Smoking (PY)

14.7 ± 21.8

13.8 ± 18.1

0.64

Smoker (%)

45.3% (168/371)

49.1% (78/159)

0.43

FEV1/FVC < 70 (%)

32.1% (119/371)

34.0% (54/159)

0.67

Female

N

361

117

Age (years)

67.8 ± 6.9

67.0 ± 8.2

0.37

Height (cm)

153.7 ± 6.0

153.5 ± 5.8

0.86

Weight (kg)

58.5 ± 9.1

58.8 ± 9.4

0.75

BMI (kg/m2)

24.8 ± 3.6

25.0 ± 3.9

0.60

FVC (L)

2.47 ± 0.46

2.51 ± 0.44

0.44

FEV1 (L)

1.95 ± 0.40

1.99 ± 0.38

0.28

FEV1/FVC (%)

78.7 ± 6.9

79.5 ± 6.5

0.28

predFVC (%)

93.8 ± 17.5

95.0 ± 15.5

0.51

predFEV1 (%)

102.0 ± 23.2

104.3 ± 20.1

0.33

Smoking (PY)

0.7 ± 4.4

0.2 ± 1.9

0.10

Smoker (%)

3.3% (12/361)

2.6% (3/117)

0.68

FEV1/FVC < 70 (%)

7.2% (26/361)

7.7% (9/117)

0.86