Table 2 Association between SEP measures, health behaviours, environmental hazards and FEV₁% and interactions between childhood SEP with health behaviours and environmental hazards

Childhood SEP

Advantaged childhood SEP as reference

Disadvantaged childhood SEP

-2.52 % (-3.18 %, -1.87 %)

0.78 % (-0.52 %, 2.07 %)

Adult SEP

Advantaged adult SEP as reference

Disadvantaged adult SEP

-1.28 % (-1.97 %, -0.59 %)

-1.33 (-2.02 %, -0.64 %)

Smoking

Never smoker as reference

Smoker

-4.58 % (-6.13 %, -3.03 %)

-1.67 % (-3.55 %, 0.21 %)

Former smoker

-0.98 % (-1.67 %, -0.34 %)

0.35 % (-0.51 %, 1.20 %)

Physical activity

Physically active as reference

Low physical activity

-2.83 % (-3.52 %, -2.14 %)

-2.15 % (-3.04 %, -1.26 %)

Obesity

Not obese as reference

Obese

-3.61 % (-4.26 %, -2.97 %)

-3.46 % (-4.29 %, -2.63 %)

Occupational exposure

No occupational exposures as reference

Occupational exposure to COPD hazards

-0.88 % (-1.54 %, -0.23 %)

-0.08 % (-0.91 %, 0.76 %)

Household

Household smoking

No ETS as reference

ETS

-0.42 % (-1.78 %, 0.95 %)

-0.93 % (-2.55 %, 0.69 %)

Household SEP

Advantaged household SEP as reference

Disadvantaged household SEP

-2.58 % (-3.70 %, -1.46 %)

-2.51 % (-3.62 %, -1.39 %)

Area

Air pollution

Below average air pollution as reference

Above average air pollution

-1.66 % (-2.36 %, -0.95 %)

-1.63 % (-2.49 %, -0.76 %)

Area deprivation

Below average area deprivation as reference

Above average area deprivation

-0.96 % (-1.71 %, -0.22 %)

-0.91 % (-1.66 %, -0.17 %)

Interactions

-6.47 % (-9.51 %, -3.42 %)

-2.71 % (-4.09 %, -1.34 %)

-1.29 % (-2.63 %, 0.05 %)

-0.38 % (-1.68 %, 0.92 %)

-1.55 % (-2.85 %, -0.25 %)

Cross level interactions

1.01 % (-1.59 %, 3.61 %)

0.01 % (-1.35 %, 1.34 %)

Constant

99.68 % (98.99 %, 100.36 %)

98.16 % (97.36 %, 98.97 %)