Table 1 Subgroup analyses of the prevalence of headache
Subgroup | No. of studies | No. of Total Participants | No. of Cases | Prevalence (%) | 95%CI | Heterogeneity Test | |
|---|---|---|---|---|---|---|---|
I2 (%) | P value | ||||||
Type | |||||||
  Migraine | 18 | 5060 | 576 | 8.8 | 6.4–12.2 | 93 |  < 0.01 |
  MA | 3 | 1373 | 47 | 3.7 | 2.6–5.3 | 30 |  = 0.24 |
  POH | 16 | 6723 | 3508 | 13.9 | 8.0–23.9 | 99 |  < 0.01 |
  IIH | 6 | 12,978 | 944 | 7.2 | 5.4–9.7 | 79 |  < 0.01 |
  PIH | 7 | 1712 | 144 | 7.1 | 2.5–20.2 | 98 |  < 0.01 |
  TTH | 4 | 1018 | 156 | 15.5 | 8.5–28.1 | 94 |  < 0.01 |
Location | |||||||
  One side | 5 | 1533 | 101 | 5.8 | 2.1–15.9 | 96 |  < 0.01 |
  Both sides | 5 | 1361 | 86 | 6.2 | 3.3–11.5 | 88 |  < 0.01 |
Duration | |||||||
  Intermittent pain | 4 | 876 | 139 | 14.9 | 8.8–25.2 | 91 |  < 0.01 |
  Persistent headache | 3 | 689 | 60 | 7.8 | 3.7–16.7 | 88 |  < 0.01 |
Site of cerebral infarction | |||||||
  Cortical infarction | 6 | 1520 | 59 | 4.3 | 2.5–7.5 | 79 |  < 0.01 |
  Vertebrobasilar artery | 5 | 1483 | 101 | 5.3 | 2.5–11.2 | 92 |  < 0.01 |
  Internal carotid artery | 5 | 1483 | 153 | 8.8 | 3.5–22.1 | 97 |  < 0.01 |