Predicting frequent COPD exacerbations using primary care data [Corrigendum]

This article refers to:

Predicting frequent COPD exacerbations using primary care data

Kerkhof M, Freeman D, Jones R, Chisholm A, Price DB. Int J Chron Obstruct Pulmon Dis. 2015;10:2439–2450.

Page 2450, the formula shown in the Supplementary materials is incorrect. The correct formula is shown below.

The formula: Risk of ≥2 COPD exacerbations within the next 12 months =1/{1 + exp[− (−0.7306 + 0.8840 × 1 previous exacerbation in last 12 months + 1.4786 × 2 previous exacerbations in last 12 months + 1.9857 × 3 previous exacerbations in last 12 months + 2.8811 × ≥4 previous exacerbations in last 12 months − 0.0093 × FEV₁% predicted + 0.0360 × age − 0.0004 × age² − 1.2194 × height (in meter) + 0.2518 × (blood eosinophil count ≥400/μL in a patient who is not currently smoking) + 0.2953 × any evidence of asthma × 0.3018 × history of non-allergic rhinitis + 0.3298 × history of nasal polyps + 0.1164 × history of ischemic heart disease + 0.1071 × history of anxiety or depression + 0.1689 × history of GERD)]}. For the yes/no variables, a value of 1 should be used for “yes” and a value of 0 for “no.”