Table 3 Association between socioeconomic status and spirometry in patients < 65 years

Age (increasing)

1.01 (1.01-1.01)

-

1.01 (1.01-1.01)

-

1.01 (1.01-1.01)

-

P < 0.001

P < 0.001

P < 0.001

Gender

-

-

-

-

0.83 (0.79-0.87)

-

P < 0.001

High severity

No

1

-

1

-

1

-

Yes

6.19 (5.57-6.88)

-

6.89 (6.25-7.60)

-

6.57 (6.11-7.06)

-

P < 0.001

P < 0.001

P < 0.001

Highest attained education

  <10

1

1

1

1

1

1

  10-12

1.03 (0.95-1.11)

1.04 (0.95-1.13)

0.96 (0.89-1.03)

1.00 (0.92-1.08)

0.99 (94–1.05)

1.01(0.95-1.08)

P = 0.534

P = 0.413

P = 0.262

P = 0.929

p = 0.815

p = 0.679

  >12

0.88 (0.80-0.97)

0.92 (0.83-1.03)

0.82 (0.75-0.89)

0.86 (0.78-0.94)

0.84 (0.78-0.89)

0.88 (0.82-0.95)

P = 0.012

P = 0.137

P < 0.001

P = 0.001

P < 0.001

P < 0.001

Income (quartiles)

  1st

1

1

1

1

1

1

  2nd + 3rd

1.16 (1.05-1.28)

1.18 (1.06-1.30)

1.08 (0.99-1.18)

0.99 (0.90-1.09)

1.12 (1.05-1.19)

1.08 (1.00-1.13)

P = 0.002

P = 0.002

P = 0.079

P = 0.882

p = 0.001

p = 0.039

  4th

1.16 (1.05-1.29)

1.12 (1.00-1.26)

1.14 (1.04-1.25)

1.00 (0.89-1.11)

1.16 (1.08-1.24)

1.06 (0.98-1.14)

P = 0.005

P = 0.052

P = 0.007

P = 0.981

P < 0.001

p = 0.177

Labour market status

  Working

1

1

1

1

1

1

  Retirement pension

1.69 (1.41-2.02)

1.20 (0.98-1.48)

1.47 (1.26-1.71)

1.07 (0.89-1.27)

1.54 (1.37-1.73)

1.12 (0.98-1.28)

P < 0.001

P = 0.082

P < 0.001

P = 0.475

P < 0.001

p = 0.091

  Unemployed

0.99 (0.90-1.09)

0.82 (0.73-0.91)

1.09 (1.00-1.19)

0.91 (0.83-1.00)

1.04 (0.97-1.10)

0.87 (0.81-0.93)

P = 0.849

P < 0.001

P = 0.045

P = 0.049

p = 0.272

P < 0.001

Cohabitation

Married/Cohabiting

1

1

1

1

1

1

Living alone

1.01 (0.94-1.09)

0.99 (0.91-1.07)

1.03 (0.96-1.10)

1.03 (0.95-1.11)

1.02 (0.97-1.07)

1.01 (0.95-1.07)

P = 0.703

P = 0.752

P = 0.438

P = 0.492

p = 0.423

p = 0.762