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Table 3 Negative binomial regression model

From: Iron in airway macrophages and infective exacerbations of chronic obstructive pulmonary disease

Coefficients

Estimate

Standard Error

p-value

95% CI

Rate ratio

95% CI

Intercept

0.115

2.603

0.965

− 4.987 to 5.217

1.122

0.007 to 184.361

Admissions in last year

0.098

0.213

0.646

− 0.320 to 0.516

1.103

0.726 to 1.675

FEV1%Predicted

− 0.049

0.025

0.051

− 0.099 to 0.000

0.952

0.906 to 1.000

SHI at follow-up

0.035

0.016

0.035

0.002 to 0.067

1.035

1.002 to 1.069

Age

− 0.008

0.045

0.860

− 0.097 to 0.081

0.992

0.908 to 1.084

Sex

0.417

0.620

0.502

− 0.799 to 1.633

1.517

0.450 to 5.119

ICS use

0.862

1.377

0.531

− 1.837 to 3.561

2.368

0.159 to 35.187

  1. FEV1 forced expiratory volume in 1-s, SHI sputum hemosiderin index, ICS inhaled corticosteroid