Table 4.

Simple linear and multiple linear regression analyses of demographic and clinical variables in relation to the EASi-QoL emotional well-being domain

Variable	Simple linear regression			Multiple linear regression
	B	Standardised coefficient	P value	B	Standardised coefficient	P value
Sex				–	–	–
Male	Reference
Female	0.366	0.039	0.531
Age category, years				–	–	–
20–29	Reference
30–59	0.829	0.094	0.257
≥60	0.554	0.051	0.542
Body mass index category				–	–	–
Normal and underweight	Reference
Overweight	0.046	0.005	0.94
Obese	1.107	0.126	0.062
Educational level				–	–	–
College, university and above	Reference
Senior high school	0.748	0.085	0.192
Junior high school or below	1.037	0.1	0.125
Marital status				–	–	–
Never married, divorced or widowed	Reference
Being married	−0.052	−0.006	0.921
Occupation type				–	–	–
Seated work	Reference
Seated and standing work	1.202	0.142	0.09
Standing and walking work	1.44	0.104	0.147
Walking and strenuous work	−0.057	−0.006	0.943
Not working	1.25	0.111	0.146
Perceived health status
Very good or good	Reference			Reference
Fair	2.797	0.343	<0.001	1.678	0.206	0.001
Poor or very poor	6.005	0.585	<0.001	3.737	0.364	<0.001
Smoking in the past month				–	–	–
No	Reference
Occasionally	0.994	0.064	0.303
Almost daily	−0.051	−0.005	0.934
Alcohol use				–	–	–
No	Reference
Yes	−0.643	−0.077	0.209
Vegetarian diet
No	Reference			Reference
Occasionally	1.091	0.127	0.039	0.571	0.067	0.184
Yes	3.358	0.184	0.003	2.258	0.124	0.014
Exercise				–	–	–
No	Reference
Yes	0.205	0.024	0.7
Duration of sleep, hours	0.169	0.06	0.333	–	–	–
Duration of AS, years	0.017	0.042	0.5	–	–	–
mSASSS	0.049	0.133	0.032	–	–	–
ASDAS-CRP	2.59	0.527	<0.001	1.792	0.364	<0.001

Adjusted R²=0.368.

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.