“…According to previous studies, the medical services utilisation of middle-aged and older adults is influenced by various factors, such as age, gender, education, marriage, income and health insurance status 30 31. Thus, the following covariates were included in the analysis: age (continuous), sex (male or female), marital status (single or having a partner), religious denomination (do not belong to a denomination, Roman Catholic, Protestant, Orthodox, other Christian, Jew, Muslim, Hindu, Buddhist or other), educational level (lower, medium, upper), employment status (unemployed, full-time employed, part-time employed, self-employed, retired, housewife, students or other) and income level (comprising a total of ten steps).…”