Oral health literacy and its association with oral health-related quality of life amongst pregnant women: a cross-sectional study

Purpose This study aimed to evaluate the association of oral health literacy (OHL) and oral health-related quality of life (OHRQoL) of pregnant women. Methods This cross-sectional study evaluated a representative sample of pregnant women assisted in public health services in southern Brazil. Demographic, socioeconomic, psychosocial and behavioural data were collected through structured questionnaires. The Oral Health Impact Profile (OHIP-14) questionnaire was used to evaluate the OHRQoL. The Brazilian Rapid Estimate of Adult Literacy in Dentistry (BREALD-30) was used to measure OHL. Dental caries and gingival bleeding were evaluated by clinical examinations. Adjusted multilevel Poisson regression models with a hierarchical approach were used to assess the associations. The results are presented as rate ratio (RR) and 95% confidence interval (95% CI). Results A total of 520 pregnant women were evaluated. Pregnant women with lower levels of OHL presented overall OHIP-14 scores 14% higher (RR 1.14; 95% CI 1.07–1.22) than their counterparts. High household income and high education level were related to low overall OHIP-14 scores. Furthermore, less dental attendance, low social support, untreated dental caries and gingival bleeding were also associated with high overall OHIP-14 scores. Conclusion Our findings reinforce that health literacy levels influence patient-reported outcomes. Pregnant women with lower OHL were more likely to present poorer OHRQoL.