Prevalence of primary dysmenorrhea and associated factors in adult women.

Objective: This study aimed to assess the prevalence and factors associated with primary dysmenorrhea in a sample of adult women.

Methods: A cross-sectional study was carried out with women aged between 19 and 49 years from a city of northeastern Brazil. Sociodemographic, gynecological, and obstetric variables were assessed by questionnaires and interviews. Dysmenorrhea was measured by self-report, and the Numerical Pain Rating Scale measured the intensity of pain. Statistical analyses included χ2 test, ANOVA, and logistic regression.

Results: The average age was 33.2±9.1 years and the prevalence of primary dysmenorrhea was 56% for the whole sample. The average duration of symptoms was 2.7±1.8 days and the mean intensity was 6.1±2.6. The previous cesarean section was associated with a higher rate of primary dysmenorrhea (PR=2.33; 95%CI 1.11-4.90) when considering the whole sample. Women who aged 25-39 years and are insufficiently active had higher rates of primary dysmenorrhea (PR=5.24; 95%CI 1.08-27.31).

Conclusion: Primary dysmenorrhea has a high prevalence in young adults, adults, and middle-aged women. Cesarean section and being physically inactive was associated with increased rates of dysmenorrhea among adult women.