Table 3 Association (crude and adjusted odds ratio and 95%CI) between socioeconomic status and COPD prevalence in urban and rural*

118 (1.6)

1

1

66 (1.7)

1

1

146 (2.2)

1.44 (1.13-1.84)

1.23 (0.96-1.57)

190 (1.9)

1.13 (0.85-1.50)

1.21 (0.90-1.61)

220 (4.2)

2.77 (2.21-3.48)

1.67 (1.32-2.13)

683 (4.2)

2.54 (1.97-3.28)

1.76 (1.34-2.30)

< 0.001

< 0.001

< 0.001

< 0.001

165 (2.0)

1

1

132 (2.6)

1

1

144 (2.4)

1.22 (0.97-1.53)

1.15 (0.91-1.45)

257 (2.5)

0.93 (0.75-1.15)

0.84 (0.68-1.04)

126 (4.1)

2.09 (1.65-2.65)

1.64 (1.28-2.09)

465 (4.1)

1.55 (1.28-1.89)

1.03 (0.84-1.26)

< 0.001

< 0.001

< 0.001

0.279