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Table 1 Characteristics of households and individuals surveyed in 2017–2018

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 Overall
Households n = 193 n = 40 N = 233
Native households: n (%) 171 (89%) 36 (90%) 207 (89%)
Immigrant households: n (%) 22 (11%) 4 (10%) 26 (11%)
LOS** of immigrant households: median (IQR) 11 (6.25–28.5) 11 (7–12) 11 (6–27)
Median household size 7 5 6
Agriculture as main activity: n (%) 177 (92%) 33 (83%) 210 (90%)
Family history of death from epilepsy: n (%) 39 (20%) 5 (13%) 44 (19%)
Age at death of PWE: median (IQR) 22 (18–25) 20 (18-–25.25) 22 (18–25)
Participants n = 1321 n = 204 N = 1525
Age: median (IQR) 18 (8–36) 21 (8.25–45) 18 (8–37)
Age distribution: n (%)
 0–9 years 409 (31%) 56 (27%) 465 (30%)
 10–19 years 297 (22%) 43 (21%) 340 (22%)
 20–29 years 170 (13%) 23 (11%) 193 (13%)
 30–39 years 160 (12%) 24 (12%) 184 (12%)
 40–49 years 85 (6%) 17 (8%) 102 (7%)
 ≥50 years 200 (15%) 41 (20%) 241 (16%)
Gender: n (%)
 Female 679 (51%) 98 (48%) 777 (51%)
 Male 642 (49%) 106 (52%) 748 (49%)
Epilepsy cases
Total number of confirmed PWE n = 61 n = 16 N = 77
Crude epilepsy prevalence (95% CI) 4.6% (3.6–5.9) 7.8% (4.9–12.4) 5.1% (4.1–6.3)
Age and sex standardized prevalence 5.4% 9.3% 5.8%
Gender-specific prevalence: n (%)
 Female 29 (4.3%) 8 (8.2%) 37 (4.8%)
 Male 32 (5.0%) 8 (7.5%) 40 (5.3%)
Age-specific prevalence: n (prevalence)
 0–9 years 1 (0.2%) 0 (0.0%) 1 (0.2%)
 10–19 years 12 (4.0%) 2 (4.7%) 14 (4.1%)
 20–29 years 29 (17.1%) 7 (30.4%) 36 (18.7%)
 30–39 years 15 (9.4%) 4 (16.7%) 19 (10.3%)
 40–49 years 3 (3.5%) 2 (11.8%) 5 (4.9%)
 ≥ 50 years 1 (0.5%) 1 (2.4%) 2 (0.8%)
Age in years, PWE only: median (IQR) 24 (19.5–29.5) 28 (22.25–36.75) 25 (20–31)
Age at onset in years, PWE only: median (IQR) 13 (9–15)* 12 (9–15) 13 (9–15)*
Year of onset, PWE only: median (IQR) 2005 (1998–2012)* 2003 (1997–2008) 2005 (1998–2011)*
Type of seizures, PWE only: n (%)
 Only nodding seizures 2 (3.3%) 2 (12.5%) 4 (5.2%)
 Nodding and other types of seizures 7 (11.5%) 1 (6.2%) 8 (10.4%)
 Other types of seizures 52 (85.2%) 13 (81.2%) 65 (84.4%)
  1. CI, Confidence interval, IQR Interquartile range, *5 data missing, **LOS length of stay, PWE Persons with epilepsy