ABSTRACTBACKGROUND:Abnormal uterine bleeding (AUB) is a common condition, and the Menstrual
Bleeding Questionnaire (MBQ) is used for its assessment.OBJECTIVES:To translate, assess the cut-off point for diagnosis, and explore
psychometric properties of the MBQ for use in Brazilian Portuguese.DESIGN AND SETTING:Prospective cohort study including 200 women (100 with and 100 without AUB)
at a tertiary referral center.METHODS:MBQ translation involved a pilot-testing phase, instrument adjustment, data
collection, and back-translation. Cut-off point was obtained using receiver
operating curve analysis. Menstrual patterns, impact on quality of life due
to AUB, internal consistency, test-retest, responsiveness, and discriminant
validity were assessed. For construct validity, the Pictorial Blood
Assessment Chart (PBAC) and World Health Organization Quality of Life –
abbreviated version (WHOQOL-BREF) were applied.RESULTS:Women with AUB were older, had higher body mass indices, and had a worse
quality of life during menstruation. Regarding the MBQ's psychometric
variables, Cronbach's alpha coefficient was > 0.70 in all analyses, high
intraclass correlation coefficient was found in both groups; no ceiling and
floor effects were observed, and construct validity was demonstrated
(correlation between MBQ score, PBAC score, and clinical menstrual cycle
data). No difference between MBQ and PBAC scores were perceived after the
test-retest. Significant differences were found between MBQ and PBAC scores
before and after treatment. An MBQ score ≥ 24 was associated with a high
probability of AUB; accuracy of 98%.CONCLUSION:The MBQ is a reliable questionnaire for Brazilian women. The cut-off ≥ 24
shows high accuracy to discriminate AUB.