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Prevalence of Blastocystis hominis by age in all the subjects in the study (A) and among Qataris (B). The overall likelihood ratio for the goodness of fit of the minimum sufficient model, based on fitting PERIOD rather than YEAR was χ2337 = 346.1 (P = 0.354) for A, and for B where region of origin was omitted because the model was focused solely on Qataris, χ251 = 61.0, (P = 0.159). For the assessment of the significance of individual terms see the text.
