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Table 1 Demographic and parasitological characteristics of the datasets used to parameterise the model

From: Modelling Neglected Tropical Diseases diagnostics: the sensitivity of skin snips for Onchocerca volvulus in near elimination and surveillance settings

Country No. of villages n a Median (Interquartile range) age (years) % Female Location of skin snips Mean microfilarial load (mf/mg skin) Mean weight of skin snips (mg) References
Guatemala 3 1,067 19 (10, 36) 44.2 1 shoulder & 1 hip shoulder = 26.3
hip = 25.4
shoulder = 1.35
hip = 1.80
[24]
Venezuela 14 613 22 (12, 35) 39.8 1 shoulder & 1 hip shoulder = 14.2
hip = 31.9c
shoulder = 1.32
hip = 1.73
[3032]
Ghana 18 172b 17–60b 18.2–31.1 2 hip & 2 calf hip = 27.4
calf = 16.6c
hip = 2.15
calf = 2.14
[33]
Cameroon 5 2,528 17 (10, 35) 49.1 2 hip & 2 calf or 2 calf hip = 8.0
calf = 9.5
Not weighedd [34]
  1. a n, number of individuals whose skin snip data were used in the model
  2. bParticipants were allocated to four treatment groups. The mean age in the four groups ranged from 32.1 to 38.3 years. The table indicates the minimum and maximum age across all treatment groups
  3. c P-value for comparison of microfilarial load between the two body sites: P < 0.001 Venezuela; P < 0.001 Ghana
  4. dSkin snips were not weighed in Cameroon, so it was assumed that a skin snip taken from the hip weighed 2.2 mg, and that one taken from the calf weighed 2.1 mg based on the data from Ghana