Table 2 Crude and adjusted incidence rate ratios (1991–2017).

From: Lung function in adults and future burden of obstructive lung diseases in a long-term follow-up

Lung function

Years

Crude IRR (95% CI)

Adjusted IRRa (95% CI)

GP contacts

FEV1/FVC (<70)

1991–2017

1.39 (1.28; 1.52)

1.40 (1.28; 1.54)

1991–2003

1.36 (1.17; 1.57)

1.40 (1.23; 1.68)

2004–2017

1.44 (1.30; 1.59)

1.41 (1.26; 1.58)

FEV1/FVC (70–75)

1991–2017

1.14 (1.07; 1.21)

1.14 (1.07; 1.21)

1991–2003

0.95 (0.88; 1.03)

0.99 (0.92; 1.07)

2004–2017

1.29 (1.18; 1.41)

1.24 (1.14; 1.35)

Income, yearly

FEV1/FVC (<70)

1991–2017

0.90 (0.87; 0.93)

0.93 (0.91; 0.97)b

1991–2003

0.92 (0.89; 0.95)

0.94 (0.91; 0.97)b

2004–2017

0.90 (0.86; 0.95)

0.94 (0.90; 0.98)b

FEV1/FVC (70–75)

1991–2017

0.93 (0.91; 0.96)

0.96 (0.93; 0.98)b

1991–2003

0.98 (0.95; 1.01)

0.99 (0.96; 1.02)b

2004–2017

0.91 (0.88; 0.94)

0.93 (0.91; 0.96)b

Daily defined dose

FEV1/FVC (<70)

1995–2017

20.44 (16.88; 24.76)

21.12 (17.38; 25.66)

1995–2003

13.70 (8.82; 21.30)

17.38 (10.94; 27.62)

2004–2017

23.65 (19.03; 29.39)

24.02 (19.34; 29.84)

FEV1/FVC (70–75)

1995–2017

3.01 (2.40; 3.77)

3.37 (2.69; 4.23)

1995–2003

2.86 (1.78; 4.59)

3.58 (2.25; 5.69)

2004–2017

2.91 (2.22; 3.81)

3.21 (2.45; 4.21)

Hospital contacts

FEV1/FVC (<70)

1991–2017

19.37 (11.66; 32.17)

14.30 (8.43; 24.25)

1991–2003

10.56 (4.25; 26.25)

3.54 (1.32; 9.49)

2004–2017

26.10 (13.40; 50.82)

18.67 (10.27; 33.97)

FEV1/FVC (70–75)

1991–2017

2.61 (1.47; 4.62)

3.39 (1.96; 5.85)

1991–2003

0.95 (0.32; 2.89)

1.73 (0.56; 5.37)

2004–2017

2.91 (1.38; 6.15)

3.38 (1.71; 6.69)

Unemployment

FEV1/FVC (<70)

1991–2017

2.26 (2.03; 2.50)

2.04 (1.84; 2.26)

1991–2003

2.05 (1.77; 2.37)

1.79 (1.55; 2.08)

2004–2017

2.57 (2.22; 2.97)

2.42 (2.10; 2.78)

FEV1/FVC (70–75)

1991–2017

1.06 (0.94; 1.19)

1.08 (0.96; 1.21)

1991–2003

1.07 (0.92; 1.25)

1.08 (0.92; 1.25)

2004–2017

1.04 (0.87; 1.25)

1.06 (0.89; 1.28)

  1. FEV1 forced expiratory volume in 1 s, FVC forced vital capacity, GP general practitioner, IRR incidence rate ratios.
  2. aAdjusted for sex, age and smoking status.
  3. bAdjusted for sex, age, smoking status and education level.