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Table 4 Relation between smoking history, CRP, FEV1 and FIV1 in patients with airway obstruction

From: The added value of C-reactive protein to clinical signs and symptoms in patients with obstructive airway disease: results of a diagnostic study in primary care

Smoking [pack year] n CRP [mg/l]
mean (sd)
FEV1 [l]
mean (sd)
FEV1pred. [%]
mean (sd)
FIV1 [l]
mean (sd)
0 < py ≤ 5 10 2.9 (1.6) 2.7 (1.0) 79.1 (22.0) 3.2 (0.1)
5 < py ≤ 10 3 3.2 (2.3) 3.0 (0.8) 89.8 (4.8) 3.5 (0.8)
10 < py ≤ 20 6 5.3 (4.2) 3.2 (1.4) 93.6 (14.6) 3.3 (1.1)
py > 20 4 13.7 (8.4) 2.7 (1.4) 82.1 (13.4) 3.3 (2.1)
p   0.001 0.381 0.552 0.147