Table 4: Frequency of incorrectly answered questions and mean score and effect size of questions on preeducation and posteducation questionnaire.
 Number of Nurses Answered Incorrectly n () Mean total score (±SD) Questions Pre-education (n=125) Post-education (n=94) Pre-education Post-education P Value Effect size What is the QuantiFERON Gold test used for? 14 (11.2) 3 (3.19) 89.4 (±31.0) 96.8 (±17.7) 0.034 0.30 What is the acceptable volume for QFT blood collection tubes? 92 (73.6) 42 (44.7) 29.8 (±46.0) 55.3 (±50.0) <0.001 0.53 After blood is collected into the QFT blood collection tubes, what is the next step in the process? 9 (7.2) 15 (16.0) 92.6 (±26.4) 84.0 (±36.8) 0.059 0.27 What is the purpose of shaking the QFT blood collection tubes? 82 (65.6) 49 (52.1) 35.1 (±48.0) 47.9 (±50.2) 0.018 0.26 At what temperature do you store the tubes until they are delivered to the laboratory? 80 (64.0) 30 (31.9) 36.2 (±48.3) 68.1 (±46.9) <0.001 0.67 What is the proper order for filling the blood collection tubes? 75 (60.0) 19 (20.2) 41.5 (±49.5) 79.8 (±40.4) <0.001 0.85 Is frothing of blood in the QFT blood collection tubes normal after the shaking process? 29 (23.2) 15 (16.0) 79.8 (±40.4) 84.0 (±36.8) 0.374 0.11 Choose the appropriate phrase to complete the following sentence: When a “butterfly needle” is being used to collect blood, which is often done when many tubes require blood collection.... 69 (55.2) 35 (37.2) 46.8 (±50.2) 62.8 (±48.6) 0.008 0.32 Can blood be drawn from a PICC or Central line for the QFT? 57 (45.6) 16 (70.0) 55.3 (±50.0) 83.0 (±37.8) <0.001 0.62 Is inverting the tubes once an acceptable mixing method immediately after blood collection? 31 (24.8) 15 (15.96) 77.7 (±41.9) 84.0 (±36.8) 0.181 0.16 Is the IGRA test FDA approved for person who has been identified with TB disease? 93 (74.4) 69 (73.4) 24.5 (±43.2) 26.6 (±44.4) 0.640 0.05
Pre- and posttest comparison calculated by paired t-test in nurses who completed both pre- and posttests (N=94). Effect size was estimated using Cohen’s d method; QFT, QuantiFERON Gold In-Tube; PICC, peripherally inserted central catheter; IGRA, interferon-γ release assay; FDA, US Food and Drug Administration; TB, tuberculosis.