Table 3 Characteristics of primary headache
From: Analysis of risk factors for medication-overuse headache relapse: a clinic-based study in China
Indicators | Case group | Control group | Statistic | P |
|---|---|---|---|---|
Course of primary headache | 10 ~ 45 (20) | 2 ~ 35 (8) | Z = −5.973 | < 0.001 |
Headache frequency (days/month) | 8.70 ± 2.072 | 7.12 ± 2.607 | t = 2.780 | 0.007 |
Duration of each attack (h) | 1 ~ 6 (3) | 1 ~ 12 (2) | Z = −1.922 | 0.055 |
Headache degree (VAS) | 6.22 ± 1.050 | 5.78 ± 0.966 | t = 1.918 | 0.058 |