Fig. 1.

Association between score for adherence to the food-based Japanese dietary guidelines and prevalence of poor oral health-related quality of life (OHRQoL) using a restricted cubic spline logistic regression model. Poor OHRQoL is defined as a score ≤ 50 on a validated Geriatric Oral Health Assessment Index (GOHAI). Solid lines represent OR, and dashed lines represent 95 % CI. We calculated OR for the prevalence of poor OHRQoL by using the first quartile value of 43·3 points as the reference. This analysis included 7902 participants. We estimated that P < 0·05 and P ≥ 0·05 when the 95 % CI of the OR did not exceed 1·00 and exceeded 1·00, respectively. Analyses were adjusted for age, sex, population density, BMI, physical activity, smoking status, alcohol intake status, educational attainment, medication use, living alone, socio-economic status, green tea consumption, coffee consumption, history of disease (hypertension, diabetes, dyslipidaemia, heart disease and stroke), denture use, poor mastication, dry mouth, choking accidents, regular dental check-up and daily tooth brushing.