Summary: Objective: to evaluate the pelvic floor muscles and the incidence of pelvic organ prolapse among indigenous women who lives in Xingu Indian Park, Mato Grosso, Brazil. Methods: observational study with 377 indigenous women, mean age 31±15 years, mean gravity 5±4, mean parity 4±3 and mean body mass index 23,3±4 Kg/m 2 . The Pelvic Organ Prolapse Quantification (POP-Q) was the system used to quantification the staging of pelvic support and the pelvic floor muscle strength was assessed by a perineometer. Logistic regression was used to determine odds ratios and 95% CI for factors that were associated with prolapse. Results: The overall distribution of POP-Q stage system was the following: 15,6% stage 0, 19,4% stage I, 63,9% stage II and 0,8% stage III. Parity (OR=9.40, 95% CI 2.81-31,42) and age (OR=1,03, 95% IC 1,01-1,05) were the most important risk factors for pelvic organ prolapse. The high resting pressure was considered as a protector factor (OR=0,96, 95% IC 0,98). Conclusions: Like non indigenous community, age and the parity were the most important risk factors to the genital prolapse; however the pelvic floor muscles strength were intact, maybe due to the indigenous lifestyle.
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