Variable | Simple linear regression | Multiple linear regression | ||||
B | Standardised coefficient | P value | B | Standardised coefficient | P value | |
Sex | – | – | – | |||
Male | Reference | |||||
Female | 0.67 | 0.071 | 0.247 | |||
Age category, years | – | – | – | |||
20–29 | Reference | |||||
30–59 | 0.381 | 0.044 | 0.594 | |||
≥60 | 2.054 | 0.189 | 0.021 | |||
Body mass index category | – | – | – | |||
Normal and underweight | Reference | |||||
Overweight | 0.139 | 0.015 | 0.82 | |||
Obese | 1.406 | 0.161 | 0.016 | |||
Educational level | ||||||
College, university and above | Reference | Reference | ||||
Senior high school | 0.383 | 0.044 | 0.49 | 0.054 | 0.006 | 0.912 |
Junior high school or below | 2.548 | 0.249 | <0.001 | 1.912 | 0.19 | 0.001 |
Marital status | – | – | – | |||
Never married, divorced or widowed | Reference | |||||
Being married | −0.568 | −0.068 | 0.27 | |||
Occupation type | ||||||
Seated work | Reference | Reference | ||||
Seated and standing work | 0.461 | 0.055 | 0.504 | 0.616 | 0.074 | 0.292 |
Standing and walking work | 0.98 | 0.072 | 0.31 | 0.647 | 0.048 | 0.43 |
Walking and strenuous work | −0.654 | −0.066 | 0.4 | −0.042 | −0.004 | 0.951 |
Not working | 2.08 | 0.188 | 0.013 | 1.657 | 0.149 | 0.023 |
Perceived health status | ||||||
Very good or good | Reference | Reference | ||||
Fair | 2.107 | 0.261 | <0.001 | 0.883 | 0.111 | 0.078 |
Poor or very poor | 5.553 | 0.546 | <0.001 | 3.211 | 0.319 | <0.001 |
Smoking in the past month | – | – | – | |||
No | Reference | |||||
Occasionally | −0.099 | −0.006 | 0.918 | |||
Almost daily | −0.145 | −0.015 | 0.812 | |||
Alcohol use | – | – | – | |||
No | Reference | |||||
Yes | −0.572 | −0.070 | 0.259 | |||
Vegetarian diet | – | – | – | |||
No | Reference | |||||
Occasionally | −0.104 | −0.012 | 0.844 | |||
Yes | 2.682 | 0.148 | 0.017 | |||
Exercise | – | – | – | |||
No | Reference | |||||
Yes | −0.044 | −0.005 | 0.933 | |||
Duration of sleep, hours | 0.17 | 0.06 | 0.327 | – | – | – |
Duration of AS, years | 0.042 | 0.107 | 0.082 | – | – | – |
mSASSS | 0.072 | 0.196 | 0.001 | – | – | – |
ASDAS-CRP | 2.221 | 0.456 | <0.001 | 1.527 | 0.318 | <0.001 |
Adjusted R2=0.327.
AS, ankylosing spondylitis; ASDAS-CRP, Ankylosing Spondylitis Disease Activity Score-C reactive protein; EASi-QoL, Evaluation of Ankylosing Spondylitis Quality of Life; mSASSS, modified Stoke Ankylosing Spondylitis Spinal Score.