Construction and validation of a risk prediction model for depressive symptoms in a middle-aged and elderly arthritis population

Table 3 Instance of variable assignment

Variable	Assignment mode
Health status	Bad = 0. Mediocre = 1. General = 2. Rather or relatively good = 3. Excellent = 4
ADL-6	Not-difficult = 0. Difficult = 1
Education	Below primary = 0. Secondary school = 1. Middle school = 2. High school and above = 3
Audiological status	General = 0. Bad = 1. Excellent = 2. Good = 3. Very good = 4
No. of chronic diseases	Measured value
No. of painful sites	Measured value
Nighttime sleep duration	Measured value
Age	Measured value

ADL: Activities of daily living.