Clinical efficacy. (A) Proportion of patients in the etanercept and placebo groups achieving clinical endpoints at week 8 of the double-blind period. Logistic regression, LOCF (except PASS, which was calculated in observed cases). (B) Proportion of patients in the etanercept and placebo groups achieving ASDAS-CRP disease activity states at week 8 of the double-blind period. Post hoc analysis of ITT population; n = number of patients with nonmissing ASDAS-CRP results at each visit. Inactive disease = ASDAS-CRP <1.3; moderate disease activity = 1.3 ≤ ASDAS-CRP <2.1; high disease activity = 2.1 ≤ ASDAS-CRP <3.5; very high disease activity = ASDAS-CRP ≥3.5. ASAS, Assessment of SpondyloArthritis International Society; ASDAS-CRP, Ankylosing Spondylitis Disease Activity Score based on C-reactive protein; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; ITT, intent-to-treat; LOCF, last observation carried forward; PASS, patient acceptable symptom state.