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Figure. a, the average probability of having a lesion at different
levels of lesion prevalence recorded among other members of the same household
(open circles) and the unadjusted fit (solid line) from the logistic regression.
b, the average probability of having a scar at different levels of scar
prevalence recorded in other members of the same household (open circles)
and the unadjusted fit (solid line) from the logistic regression. c, average
probability of having a scar at different levels of scar prevalence in
nearest neighbor households (open circles) and the unadjusted fit (solid
line) from the logistic regression. d, force of infection, λ, can
be estimated from the age-prevalence data, where the proportion, P, of
persons with ACL at age a (where a is age at last birthday
plus 0.5 years) is given by P(a) = 1-exp(-λa) (6).
If one assumes that age-independent transmission started 12 years earlier
(1), λ was estimated by maximum likelihood
by using the observed age-prevalence data for children <12 y
of age.
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