Table 5.
Simple linear and multiple linear regression analyses of demographic and clinical variables in relation to the EASi-QoL social participation domain
| Variable | Simple linear regression | Multiple linear regression | ||||
| B | Standardised coefficient | P value | B | Standardised coefficient | P value | |
| Sex | – | – | – | |||
| Male | Reference | |||||
| Female | −0.090 | −0.010 | 0.875 | |||
| Age category, years | – | – | – | |||
| 20–29 | Reference | |||||
| 30–59 | 0.688 | 0.079 | 0.337 | |||
| ≥60 | 0.691 | 0.064 | 0.437 | |||
| Body mass index category | ||||||
| Normal and underweight | Reference | Reference | ||||
| Overweight | −0.146 | −0.016 | 0.809 | −0.033 | −0.004 | 0.943 |
| Obese | 1.421 | 0.165 | 0.014 | 0.995 | 0.117 | 0.026 |
| Educational level | – | – | – | |||
| College, university and above | Reference | |||||
| Senior high school | 0.875 | 0.102 | 0.118 | |||
| Junior high school or below | 1.42 | 0.14 | 0.032 | |||
| Marital status | – | – | – | |||
| Never married, divorced or widowed | Reference | |||||
| Being married | −0.362 | −0.044 | 0.478 | |||
| Occupation type | ||||||
| Seated work | Reference | Reference | ||||
| Seated and standing work | 1.274 | 0.155 | 0.066 | 1.455 | 0.177 | 0.007 |
| Standing and walking work | 1.48 | 0.11 | 0.126 | 1.187 | 0.088 | 0.109 |
| Walking and strenuous work | 0.172 | 0.017 | 0.825 | 1.052 | 0.107 | 0.081 |
| Not working | 1.515 | 0.138 | 0.071 | 1.415 | 0.129 | 0.03 |
| Perceived health status | ||||||
| Very good or good | Reference | Reference | ||||
| Fair | 2.678 | 0.335 | <0.001 | 1.208 | 0.153 | 0.009 |
| Poor or very poor | 5.97 | 0.593 | <0.001 | 3.231 | 0.324 | <0.001 |
| Smoking in the past month | – | – | – | |||
| No | Reference | |||||
| Occasionally | 0.907 | 0.06 | 0.338 | |||
| Almost daily | 0.188 | 0.019 | 0.756 | |||
| Alcohol use | – | – | – | |||
| No | Reference | |||||
| Yes | −0.205 | −0.025 | 0.683 | |||
| Vegetarian diet | ||||||
| No | Reference | Reference | ||||
| Occasionally | 0.675 | 0.08 | 0.192 | 0.278 | 0.034 | 0.493 |
| Yes | 3.495 | 0.195 | 0.002 | 2.568 | 0.146 | 0.003 |
| Exercise | – | – | – | |||
| No | Reference | |||||
| Yes | 0.157 | 0.019 | 0.763 | |||
| Duration of sleep, hours | 0.037 | 0.013 | 0.828 | – | – | – |
| Duration of AS, years | 0.008 | 0.021 | 0.738 | – | – | – |
| mSASSS | 0.061 | 0.168 | 0.007 | – | – | – |
| ASDAS-CRP | 2.746 | 0.569 | <0.001 | 1.99 | 0.419 | <0.001 |
Adjusted R2=0.425.
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.