Table 2 Crude and adjusted hazard ratios (HR) of 5-year mortality from time since IPF diagnosis, for the significant baseline predictors at diagnosis, with categories defined by the GAP index, as estimated by the Cox proportional hazards model

  > 65 years

1.25

1.52 (1.14–2.03)

 61–65 years

0.99

1.01 (0.70–1.47)

  ≤ 60 years

Reference

Reference

Male sex

1.76

1.51 (1.15–1.96)

  < 50%

5.62

3.45 (2.28–5.23)

 50–75%

2.66

1.89 (1.47–2.42)

  > 75%

Reference

Reference

  ≤ 35%

6.22

3.52 (2.40–5.18)

 36–55%

3.90

3.05 (2.13–4.36)

  > 55%

Reference

Reference

Pulmonary hypertension

2.63

2.04 (1.46–2.86)

Lung cancer

3.47

2.55 (1.33–4.92)

Long-term oxygen therapy

2.35

1.49 (1.19–1.88)