Table 5.

RR and 95% CI estimates of adenoma recurrence by intervention status in the PPT-CFS after adjustment for missing responses by imputation

AdenomaControl, n (%)*Intervention, n (%)*RR (95% CI)P
≥1147 (37.1)144 (35.6)0.98 (0.88-1.09)0.74
178 (19.7)82 (20.2)1.01 (0.86-1.20)0.88
235 (8.8)37 (9.1)1.01 (0.78-1.31)0.95
≥334 (8.6)25 (6.2)0.77 (0.57-1.05)0.10
Multiple (>1)69 (17.4)62 (15.3)0.92 (0.77-1.10)0.34
Advanced32 (8.1)34 (8.4)1.06 (0.81-1.39)0.67
High risk58 (14.6)48 (11.9)0.85 (0.67-1.06)0.16
Proximal91 (23.0)80 (19.8)0.86 (0.73-1.01)0.06
Distal57 (14.4)51 (12.6)0.94 (0.75-1.18)0.59
  • NOTE: The estimated RRs were calculated using both actual data from the PPT-CFS participants and the imputed values from the prediction model for nonparticipants.

  • * Number and percentage with lesion. Percentages were calculated from the PPT-CFS total for the control (n = 396) and intervention (n = 405) groups. In the case of high-risk, proximal, and distal adenomas, these categories are not mutually exclusive (percentage columns will therefore not sum to 100).

  • CIs were computed using the percentile method.

  • P values were computed from z test.