Table 3 Distribution of allelic frequencies of CYP1A2 −163A > C SNP in triptan abuser and non-abuser classes assessed by Chi-test analysis
From: Genetic polymorphisms related to efficacy and overuse of triptans in chronic migraine
−163A > C (CYP1A2*1F) alleles | Abusers (n = 75) n (%) | Non-abusers (n = 51) n (%) | ||
|---|---|---|---|---|
Obs. | Exp. | Obs. | Exp. | |
A | 108 (72.0) | 100 (66.6) | 60 (58.9) | 68 (66.6) |
C | 42 (28.0) | 50 (33.4) | 42 (41.2) | 34 (33.4) |