Table 2 Inflammatory markers in patients with normal and raised CRP levels and in healthy controls.

	COPD		Controls
	Normal CRP	Raised CRP
TNFα (pg/ml)	1.25 (0.60–3.42)	1.31 (0.43–3.19)	1.23 (0.74–2.70)
sTNF‐R55 (ng/ml)	0.87 (0.54–2.51)	1.00 (0.59–2.20)†	0.88 (0.59–1.46)
sTNF‐R75 (ng/ml)	1.42 (0.81–3.39)	1.54 (0.84–3.33)*	1.14 (0.68–1.82)
IL‐6 (pg/ml)	2.60 (1.00–11.45)*	6.45 (0.90–12.85)*†	1.76 (0.81–6.00)

Values presented as median (range).

TNF‐α, tumour necrosis factor α; sTNF‐R55/75, soluble TNF‐receptor 55/75; IL‐6, interleukin 6.

*p<0.05 v healthy controls.

†p<0.03 v normal CRP levels.