Characteristics of studies examining the association of sanitation availability or sanitation use with soil-transmitted helminth infections, including quality assessment.

aData provided by author.A.l., Ascaris lumbricoides; BM, Baermann (technique); Cal., calculated; DS, direct smear; FEC, formalin-ether concentration (technique); FES, formalin-ether sedimentation (technique); HH, household; H-M, Harada-Mori (technique); Hw, hookworm; KAP, Koga agar plate (technique); K-K, Kato-Katz (technique); Mod., modified; MVA, multivariate analysis; PAFS, polyvinyl alcohol fixative solution; PSc, pre-school children; n.s., not stated; RFEC, Ritchie's formalin-ether concentration (technique); Sc, schoolchildren; SS, stool sedimentation (technique); STH, soil-transmitted helminths; T-L, Teleman-Lima (technique); T.t., Trichuris trichiura; UVA, univariate analysis; ZSF, zinc sulfate flotation (technique).