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Table 2 Awareness and knowledge measures of all respondents 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 respondents (N = 170)
n (%)
Follow-up respondents
(N = 168)
n (%)
P value
Which of these imaging modalities involves ionising radiation (tick all that do so)?
 Ultrasound scan (USS)6 (3.5)7 (4.2)0.761
 Magnetic Resonance Imaging (MRI)13 (7.6)13 (7.7)0.975
 Computerised tomography (CT) scan166 (97.6)163 (97.0)0.722
 Chest x-ray165 (97.1)161 (95.8)0.543
 PET scan137 (80.6)139 (82.7)0.610
 Isotope bone scan142 (83.5)147 (87.5)0.300
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 cancer8 (4.7)2 (1.2)<0.001
 Associated with approximately 1 in 300 lifetime risk of subsequent cancera38 (22.4)64 (38.1) 
 Associated with approximately 1 in 3000 lifetime risk of subsequent cancera78 (45.9)74 (44.1) 
 Associated with approximately 1 in 30,000 lifetime risk of subsequent cancer35 (20.6)27 (16.1) 
 Negligible11 (6.5)1 (0.6) 
Have you noticed radiation harm information below the CT report at [hospital name]?Not asked at baseline n/a
 Yes 139 (83.7) 
 No 27 (16.3) 
  1. aBest responses