Background Repetitive Strain Injury (RSI)/Work-related Musculoskeletal Disorders (WMSD) and tendonitis are considered a serious problem in the area of Occupational Health. The present study aims to estimate the prevalence of these disorders on the adult population of a metropolis in the state of São Paulo and to analyze their impact on Health-Related Quality of Life (HRQoL), according to gender. Methods A population-based cross-sectional study was conducted using data from the “Campinas City Health Survey (ISACamp 2014/15)”. The sample consisted of 2,166 individuals aged 18 years or older and the SF-36 instrument was used for HRQoL analysis. The association between the variables was verified by the chi-square test and the Poisson simple and multiple regression models were used to estimate the prevalence ratios (PR). In HRQoL estimates, the average SF-36 scores were calculated according to the independent variables. Results The prevalence of tendonitis and RSI/WMSD was 8.5%, with 6.7% tendonitis and 2.7% RSI/WMSD. The prevalence was higher among women (11%; 1.34-2.56), on individuals aged between 40-59 years (PR = 3.63; 2.28-5.80), who were on occupational activity (PR = 2.04; 1.12-3.68) or on work leave (PR = 7.07; 2.77-18.03) and on the most educated (PR = 2.45; 1.28-4.70). Subjects with these morbidities decreased in 6 of the 8 HRQoL domains and on stratification by gender, we observed that women had greater decreases in mental component scores in the presence of RSI/WMSD and men in physical component (p < 0.05). Conclusions The diseases analyzed can affect men and women differently, and it is essential to consider the peculiarity of the impact between the sexes in the elaboration of interventions and preventive measures aimed at improving the quality of life. Key messages No population-based studies were found that assess the impact of RSI/WMSD on HRQoL, according to gender differences, showing the relevance of this study. It is very important to understand how these diseases affect men and women differently so that specific and more effective preventive and rehabilitative measures can be carried out.

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Background Bruxism is a relevant topic in public health, as it represents an increasingly frequent parafunctional activity and also for presenting musculoskeletal and dental effects affecting the health and well-being of the affected population. The reviewed literature shows that bruxism is associated with some health problems, but with multimorbidities has not yet been investigated. Objective To identify the association of bruxism with a multimorbidity pattern. Methods A population-based cross-sectional study was conducted with a sample composed of 1986 adults (≥20 years of age). This study used data from the Third Health Survey of the City of Campinas conducted in 2014 and 2015 (ISACamp 2014/15). A principal component analysis was performed to identify in which multimorbidity pattern, present in the population, bruxism is included. From this pattern, the variable number of diseases was created (0; 1; 2 to 4; 5 or more). The prevalence of bruxism was established according to this variable and associations were tested using the Rao-Scott chi-square test and Poisson regression. Results The factor analysis revealed three relevant patterns of multimorbidity in the population of Campinas. Bruxism was part of the pattern also composed of: asthma, rhinitis, sinusitis, allergy, migraine/headache, emotional/mental problem, dizziness/vertigo and back pain. The prevalence of bruxism increased more than fivefold in the concomitant presence of five or more of these conditions (PR = 5.35;95%CI:3.35 to 8.45). Conclusions Knowledge about the association of bruxism with a pattern of multimorbidities can show the direction of health actions in multidisciplinary teamwork, prioritizing the reduction in harm caused by the simultaneous presence of health problems associated with bruxism. We also emphasize the possible role of bruxism as an indicator of multimorbidities, especially those associated with the pattern found. Key messages Bruxism was more associated with multimorbidities of the pattern composed of asthma, rhinitis, sinusitis, dizziness/vertigo, migraine/headache, emotional/mental problem, back pain and allergy. The concomitant presence these conditions increased the prevalence of bruxism up to fivefold.

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