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Table 3 Awareness and knowledge measures in untrained and trained respondent subgroups before and after intervention

From: Evaluation of the impact of a brief educational message on clinicians’ awareness of risks of ionising-radiation exposure in imaging investigations: a pilot pre-post intervention study

 Baseline untrained respondents
(N = 59)
n (%)
Follow-up
untrained respondents
(N = 62)
n (%)
P valueBaseline trained respondents
(N = 111)
n (%)
Follow-up
trained respondents
(N = 106)
n (%)
P value
Which of these imaging modalities involves ionising radiation (tick all that do so)?
 Ultrasound scan (USS)4 (6.8)2 (3.2)0.4322 (1.8)5 (4.7)0.271
 Magnetic Resonance Imaging (MRI)9 (15.3)7 (11.3)0.5204 (3.6)6 (5.7)0.531
 Computerised tomography (CT) scan58 (98.3)60 (96.8)1.000108 (97.3)103 (97.2)1.000
 Chest x-ray57 (96.6)57 (91.9)0.440108 (97.3)104 (98.1)1.000
 PET scan42 (71.2)52 (83.9)0.09495 (85.6)87 (82.1)0.482
 Isotope bone scan42 (71.2)51 (82.3)0.149100 (90.1)96 (90.6)0.906
What is the average impact of a Chest, Abdomen and Pelvis CT scan on the lifetime risk of cancer for a 20 year old female?
 Associated with approximately 1 in 30 lifetime risk of subsequent cancer3 (5.1)1 (1.6)0.0475 (4.5)1 (0.9)0.008
 Associated with approximately 1 in 300 lifetime risk of subsequent cancera12 (20.3)21 (33.9) 26 (23.4)43 (40.6) 
 Associated with approximately 1 in 3000 lifetime risk of subsequent cancera24 (40.7)31 (50.0) 54 (48.6)43 (40.6) 
 Associated with approximately 1 in 30,000 lifetime risk of subsequent cancer14 (23.7)8 (12.9) 21 (18.9)19 (17.9) 
 Negligible6 (10.2)1 (1.6) 5 (4.5)0 (0.0) 
  1. aBest responses