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Table 12 Crosstabulation of CO(R) 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

19

0

≤1

1

22

  1. Fisher’s exact test statistic F = 19, P < 0.0001