Validity and reliability study of the Turkish version of the menstrual quality of life scale: A methodological study

This study aimed to evaluate the validity and reliability of the Turkish version of the Menstrual Quality of Life (PERIOD-QOL) scale. This methodological study was conducted with 332 nurses and midwives. Validity and reliability were analyzed using item analysis, content and construct validity, exploratory and confirmatory factor analysis, Cronbach's alpha coefficient, the Spearman-Brown formula, and the test-retest method. Cronbach's alpha, Spearman-Brown reliability, and test-retest reliability coefficients were 0.86, 0.81, and 0.63, respectively. According to the emerging unidimensional structure, factor loadings of the scale items were between 0.50 and 0.80, and this structure alone explained 45.75 percent of the total variance. The results of the known groups validity method showed that the mean PERIOD-QOL total score of nurses and midwives with very little to little menstrual bleeding (38.00 ± 6.89) was higher than those with heavy menstrual bleeding (28.73 ± 8.09) and very heavy to extremely heavy menstrual bleeding (23.50 ± 10.34) (p < .05). The confirmatory factor analysis revealed perfect and good-fit indices (χ²/df = 2.95, RMSEA = 0.077, SRMR = 0.044, CFI = 0.98, IFI = 0.98, GFI = 0.95, and NFI = 0.97). The mean items of the scale ranged between 2.71 ± 1.38 and 4.27 ± 1.19. The Turkish version of the PERIOD-QOL scale is a valid and reliable tool to assess the level and perception of menstrual QOL of women.