Table 3.

Multiple linear regression models depicting predictors of spinal immobility at a mean of 5.9 years later among 54 patients with ankylosing spondylitis

Modela	1		2		3		4		5
Variable	Coef. (95% CI)	p	Coef. (95% CI)	p	Coef. (95% CI)	p	Coef. (95% CI)	p	Coef. (95% CI)	p
Sex	− 0.23 (− 1.55 to 1.09)	0.731	− 0.02 (− 1.29 to 1.25)	0.972
Disease duration at study end	0.07 (0.02 to 0.12)	0.011	0.07 (0.02 to 0.12)	0.005	0.07 (0.02 to 0.12)	0.004	0.08 (0.03 to 0.13)	0.002	0.08 (0.03 to 0.13)	0.004
hsCRP	0.39 (0.15 to 0.64)	0.002	0.36 (0.12 to 0.60)	0.004	0.36 (0.13 to 0.59)	0.003	0.37 (0.14 to 0.60)	0.002	0.35 (0.12 to 0.58)	0.004
Exercise in leisure time			− 0.72 (− 1.31 to − 0.12)	0.019	− 0.72 (− 1.30 to − 0.14)	0.017	− 0.74 (− 1.33 to − 0.16)	0.014	− 0.72 (− 1.31 to − 0.13)	0.018
NSAID							0.59 (− 0.48 to 1.66)	0.273	0.73 (− 0.40 to 1.86)	0.200
BASDAI									− 0.13 (− 0.45 to 0.19)	0.413
Adjusted R2	0.16		0.23		0.25		0.25		0.25

Bold font to indicate statistically significant result at p<0.05

hsCRP, high-sensitivity C-reactive protein; NSAID, regular consumption of non-steroid anti-inflammatory drug; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index

^aRegression constant not shown