[Concepts important in the interpretation of therapeutic studies. Absolute risk reduction (ARR), relative risk reduction (RRR), number needed to treat (NNT)].
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The study of the species group autumnalis in genus Neotrombicula is carried out. Composition of the group and diagnoses of species are changed, data on variability are reported. A new species, N. oculata sp. n., is described. The new species is similar to N. turkestanica Kudryashova, 1993 and differs from it by disproportionaly large eyes, a little more numerous setae of idiosoma (NDV = 66-78 against 58-69) and their lesser lengths (Dm = 41-46 against 45-49), a lesser width of scutum (AW = 71 against 76). One species, N. alexandrae Stekolnikov, 1993, is synonymized with N. delijani Kudryashova, 1977. For N. delijani and N. turkestanica new localities and new hosts are reported.
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