Table 3 Baseline versus final values of major clinical measures.

	Patients fulfilling AS criteria (n = 21)				USpA (n = 29)
	Baseline	Final	Difference	p Value	Baseline	Final	Difference	p Value
Joints involved (n)*†	3.7 (3.4)	1.2 (2.3)	−2.5	0.006	3.5 (2.7)	2.0 (3.2)	−1.5	0.038
Entheses involved (n)*	2.5 (2.1)	2.7 (3.1)	0.1	0.82	2.7 (3.0)	2.5 (3.6)	−0.2	0.77
BASDAI*	3.9 (2.9)	4.5 (4.4)	0.6	0.54	3.8 (2.3)	3.4 (2.2)	−0.3	0.58
BASFI*	3.3 (2.6)	3.3 (2.7)	0.0	0.85	2.8 (2.1)	2.6 (1.8)	−0.9	0.08
Modified Schober's test (cm)*	4.3 (1.0)	5.5 (1.6)	1.2	0.007	4.7 (1.3)	5.5 (1.7)	0.9	0.008
Chest expansion (cm)*	4.1 (1.0)	4.1 (1.5)	0.0	0.89	3.9 (0.9)	3.7 (1.1)	−0.3	0.58
Occiput to wall distance (cm)*‡	0	0.9 (0.3)	0.9	0.162	0	0.3 (0.7)	0.3	0.058

*Student's t test.

†p = 0.006, ankylosing spondylitis v undifferentiated spondyloarthritis at final evaluation.

‡p = 0.028, ankylosing spondylitis v undifferentiated spondyloarthritis at final evaluation.

AS, ankylosing spondylitis; BASDAI, Bath ankylosing spondylitis disease activity index; BASFI, Bath ankylosing spondylitis functional index; USpA, undifferentiated spondyloarthritis.