Table 1 Demographic characteristics of chronic bronchitis, probable chronic bronchitis, and no chronic bronchitis according to physician diagnosis and ATS criteria (n = 420)^a

65.2 (12.3)

64.6 (9.1)

64.5 (9.7)

0.94

154.5 (4.3)

155.5 (5.7)

155.2 (4.8)

0.59

54.0 (10.0)

57.7 (7.5)

58.5 (7.5)

0.01

22.6 (3.9)

23.9 (3.0)

24.3 (3.1)

0.01

1.33 (0.52)^a

1.51 (0.40)

1.64 (0.48)

<0.01

1.74 (0.58)^a

1.94 (0.52)

2.00 (0.62)

0.05

76.1 (17.1)^a

78.9 (15.0)

83.8 (15.5)

<0.01

5 (15.2)

32 (17.6)

34 (16.6)

0.67

16 (48.5)

93 (51.1)

117 (57.1)

12 (36.4)

57 (31.3)

54 (26.3)

25 (75.8)

172 (94.5)

197 (96.1)

<0.01^b

8 (24.2)

10 (5.5)

8 (3.9)

33 (100)

176 (96.7)

200 (97.6)

0.14^b

0

6 (3.4)

5 (2.5)

31 (93.9)

152 (83.5)

164 (80.0)

0.13^b

2 (6.1)

30 (16.5)

41 (20.0)

14 (42.4)

81 (44.5)

89 (43.4)

0.96

19 (57.6)

101 (55.5)

116 (56.6)

2 (6.1)

9 (5.0)

6 (2.9)

0.50^b

31 (93.9)

173 (95.1)

199 (97.1)