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Table 2 Comparison of PWE from the previous and the current surveys in Bilomo and Kelleng

From: Epidemiology of onchocerciasis-associated epilepsy in the Mbam and Sanaga river valleys of Cameroon: impact of more than 13 years of ivermectin

  Bilomo Kelleng
1998 2017 P-value 2004 2018 P-value
Gender of PWE
 Male: n (%) 51 (54.8%) 27 (44.3%) 0.199 10 (52.6%) 8 (50.0%) 0.877
 Female: n (%) 42 (45.2%) 34 (55.7%) 9 (47.4%) 8 (50.0%)
Total: n (%) 93 (100%) 61 (100%)   19 (100%) 16 (100%)  
Age distribution of PWE: n (%)
 0–9 years 3 (3.2%) 1 (1.6%) < 0.001 0 (0%) 0 (0%) 0.530
 10–19 years 56 (60.2%) 12 (19.7%) 6 (31.6%) 2 (12.5%)
 20–29 years 28 (30.1%) 29 (47.5%) 8 (42.1%) 7 (43.8%)
 30–39 years 6 (6.5%) 15 (24.6%) 4 (21.0%) 4 (25.0%)
 40–49 years 0 (0%) 3 (4.9%) 1 (5.3%) 2 (12.5%)
 ≥50 years 0 (0%) 1 (1.6%) 0 (0%) 1 (6.2%)
Total 93 (100%) 61 (100%)   19 (100%) 16 (100%)  
Mean age of PWE ± SD years 18.2 ± 5.7 24.9 ± 8.1 P < 0.0001 NA 31.4 ± 15.4 NA
Age-specific prevalence: n (%)
 0–9 years 3 (0.5%) 1 (0.2%) < 0.001 0 (0.0%) 0 (0.0%) 0.676
 10–19 years 56 (12.9%) 12 (4.0%) 6 (26.1%) 2 (4.7%)
 20–29 years 28 (11.5%) 29 (17.1%) 8 (30.8%) 7 (30.4%)
 30–39 years 6 (2.6%) 15 (9.4%) 4 (14.8%) 4 (16.7%)
 40–49 years 0 (0.0%) 3 (3.5%) 1 (5.0%) 2 (11.8%)
 ≥50 years 0 (0.0%) 1 (0.5%) 0 (0.0%) 1 (2.4%)
Overall crude prevalence (%) 93/1898 (4.9%) 61/1321 (4.6%) 0.695 19/181 (10.5%) 16/204 (7.8%) 0.357
Age and sex standardized prevalence rate NA 5.4% NA 13.5% 9.3% < 0.001
Age of onset of first seizure: n (%)
Mean age at onset ± SD years 12.7 ± 5.97 12.6 ± 4.1 0.909 14.7 ± 6.5 14.1 ± 7.7 0.804
 0–2 years 4 (4.3%) 0 (0.0%) 0.944 NA 0 (0.0%) NA
 3–6 years 9 (9.7%) 4 (6.6%) 0 (0.0%)
 7–12 years 33 (35.5%) 23 (37.7%) 8 (50.0%)
 13–20 years 41 (44.1%) 26 (42.6%) 7 (43.8%)
 ≥21 years 4 (4.3%) 2 (3.3%) 1 (6.3%)
 Not known 2 (2.2%) 6 (9.8%) 0 (0.0%)
Total 93 (100.0%) 61 (100.0%) 16 (100.0%)  
Duration of epilepsy: n (%)
Mean duration ± SD years NA 12.7 ± 8.8 yrs NA 8.7 ± 7.1 yrs 17.4 ± 14.1 yrs 0.036
 0–1 year NA 5 (8.2%) NA 3 (15.8%) 0 (0.0%) 0.363
 2–5 years 10 (16.4%) 4 (21.1%) 1 (6.3%)
 6–10 years 10 (16.4%) 5 (26.3%) 5 (31.3%)
 11–20 years 18 (29.5%) 6 (31.6%) 6 (37.5%)
 > 20 years 13 (21.3%) 1 (5.3%) 4 (25.0%)
 Not known 5 (8.2%) 0 (0.0%) 0 (0.0%)
Total   61 (100.0%) 19 (100.0%) 16 (100.0%)
  1. NA Not available, SD Standard deviation, PWE Persons with epilepsy