Table 1 Study’s variables.
Variable | Classification | ||
|---|---|---|---|
Independent variable | No chronic disease | ||
Only one chronic disease | |||
Multimorbidity | |||
Dependent variable | Natural teeth count45 | having less than 20 natural teeth | |
having at lest 20 natural teeth | |||
Covariates | Sociodemographic characteristics | Gender16 | Male |
Female | |||
Age16 | 60 ≤ Age < 75 | ||
75 ≤ Age < 90 | |||
Education level16 | No education | ||
Primary to junior high school | |||
High school and above | |||
Marital status57 | Married and living with spouse | ||
Married but not living with spouse | |||
Divorced or widowed or never married | |||
Source of income19 | Sufficient | ||
Insufficient | |||
Health behavior habits | Room condition58 | Musty | |
Not musty | |||
Ventilation condition58 | Not ventilated | ||
Ventilated | |||
Main taste preference59 | Light | ||
Salty | |||
Others | |||
Frequency of fruit intake60 | Daily | ||
Often | |||
Sometimes or rarely | |||
Frequency of vegetable intake60 | Daily | ||
Often | |||
Sometimes or rarely | |||
Smoking16 | Yes | ||
No | |||
Alcohol consumption60 | Yes | ||
No | |||
Exercise60 | Yes | ||
No | |||
Ability to perform daily activities45 | Severely limited | ||
Somewhat limited | |||
Not limited | |||
Medical expenses in the past year61 | Less than 1000 yuan | ||
1000 yuan and above | |||
Annual physical examinations62 | Yes | ||
No | |||
Frequency of brushing teeth63 | Never | ||
Occasionally | |||
Often(at last once per day) | |||
Toothache in the past six months64 | Yes | ||
No | |||
BMI19 | 18.5 ≤ BMI < 24 | ||
BMI < 18.5 | |||
BMI ≥ 24 | |||
