Comparison 3. Sulfasalazine versus placebo (axial form ankylosing spondylitis, end point values).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Back pain (VAS 100 mm, 0 = no pain, 100 = severe pain)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
2 Score of sleep disturbance (0 to 4, 0 = no disturbance, 4 = severe disturbance)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
3 Chest expansion (cm)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
4 Schober's test (cm)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
5 Fingers‐to‐floor test (cm)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
6 Patient assessment of disease severity (VAS 100 mm, 0 = very good, 100 = very poor)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
7 Duration of morning stiffness (hr)	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
8 Erythrocyte sedimentation rate (mm/hr)	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected