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Table 2 Protocol compliance by final status category

From: Participant characteristics associated with withdrawal from a large randomized trial of spermicide effectiveness

  Final status category p-value
  Completed study Did not complete study  
Number of participants 879 (58%) 635 (42%)  
Median days in analysis per participant 183 32  
Mean % of expected follow-up visits completed* 85% 64% <.0001
Mean % of expected diary days recorded* 97% 72% <.0001
Mean % of expected pregnancy tests completed* 95% 97% 0.0001
  1. *The number of expected visits was prorated for each participant considering the total duration of her participation in the analysis
  2. p-value from independent sample t-test.