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Table 10 Crosstabulation of CO(L) by group

From: Elevated nitric oxide and carbon monoxide concentration in nasal-paranasal sinus air as a diagnostic tool of migraine: a case – control study

CO(L)

Group

Patient

Control

> 1

18

0

≤ 1

2

22

  1. Fisher’s exact test statistic F = 18, P < 0.0001