Table 1 Number of subjects with radiographic assessments on days 365 and 729
Abatacept n = 376 (%)Placebo n = 160 (%)
Subjects included in analyses
    Day 365328 (87.2)144 (90.0)
        Baseline and day 365328 (87.2)144 (90.0)
    Day 729324 (86.2)143 (89.4)
        Baseline and day 729315 (83.8)139 (86.9)
        Imputation on day 729*9 (2.4)4 (2.5)
Subjects not included in the analyses
        No day 365 value†2 (0.5)1 (0.6)
        No day 729 value‡6 (1.6)2 (1.3)

  • *Subjects are discontinued and qualified for imputation requirement. †Two subjects in the abatacept group had evaluative radiographic assessment outside the pre-specified visit window of day 365, and one subject in the placebo group had no radiographic assessment on day 365. ‡Subjects had evaluative radiographic assessment outside the pre-specified visit window of day 729.