A randomized trial investigates the difference in the incidence symptomatic deep vein thrombosis (DVT) when using two different injectable anticoagulants in a medically ill inpatient population. After studying 32 patients, the p value comparing the percentage of DVT in each group is calculated as 0.12. Which one of the following is an important consideration in order to apply the results of this trial correctly?

(A) type I error
(B) type II error
(C) confounding by indication
(D) interviewer bias