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Table 2 Epidemiological data

From: Cost-effectiveness analysis of interventions for migraine in four low- and middle-income countries

Epidemiological variable Sub-group China India Russian Federation Zambia
Migraine prevalence (18–65 years) Male 5.4% 19.4% 12.6% 18.0%
  Female 12.6% 32.8% 30.4% 27.1%
Case distribution (attacks per month) Low frequency [<3] 62% 63% 52% 50%
  High frequency [≥3] 38% 37% 48% 50%
Mean attacks (per month) Low frequency 1.05 1.05 1.2 0.56
  High frequency 5.65 4.59 6.4 3.94
Mean duration of attack (hours) All cases 23.4 13.1 15.0 36.4
Time spent in ictal state (per year) Low frequency 3.4% 1.9% 2.5% 2.8%
High frequency 18.1% 8.2% 13.2% 19.7%