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Individual Predisposition, Household Clustering and Risk Factors for Human Infection with Ascaris lumbricoides: New Epidemiological Insights

Figure 1

An illustration of the hierarchical structure of the data on Ascaris lumbricoides worm counts.

Participants live in households such that nk participants live in household k and there are K households all together (K = 459, see main text “Sample Size, Data Structure and Missing Values”). The total number of participants is 1,795. Each participant contributes at most three measurements of worm burden, one after each round of chemo-expulsive treatment with pyrantel pamoate, and at least one measurement (after the first round of treatment). Participants who were not “satisfactorily de-wormed” (see main text “Sample Size, Data Structure and Missing Values”) at a given round of treatment were not subsequently followed up.

Figure 1

doi: https://doi.org/10.1371/journal.pntd.0001047.g001