Table 1 Summary of study characteristics (n = 92)
From: Epidemiologic and clinical parameters of West Nile virus infections in humans: a scoping review
Study characteristic | N (%) |
|---|---|
Countrya | |
 United States | 77 (84) |
 Canada | 8 (9) |
 Israel | 7 (8) |
Case ascertainment period | |
 < 6 months | 28 (30) |
 6–12 months | 41 (45) |
 > 12 months | 23 (25) |
Sample size | |
 < 25 | 19 (21) |
 25–100 | 22 (24) |
 100–400 | 23 (25) |
 > 400 | 28 (30) |
Study designb | |
 Experimental design | 1 (1) |
  Randomized controlled trial | 1 (1) |
 Observational design | 91 (99) |
  Surveillance and monitoring program | 37 (40) |
  Case series | 30 (33) |
  Outbreak investigation | 17 (18) |
  Cohort | 4 (4) |
  Case-control | 2 (2) |
  Cross-sectional | 1 (1) |