Comparison between US and UK respondents
| Variable | Category | Percentage USA (n=1289*) | SE | Percentage UK (n=1078†) | SE | p Value |
| Gender | Female | 30.4 | 1.51 | 38.1 | 2.64 | 0.0111 |
| Male | 69.7 | 1.51 | 61.9 | 2.64 | ||
| Years in practice | <10 | 12.5 | 1.09 | 8.8 | 1.66 | 0.008 |
| 10–19 | 27.4 | 1.48 | 25.2 | 2.33 | ||
| 20–29 | 30.1 | 1.47 | 42.1 | 2.69 | ||
| ≥30 | 30.0 | 1.44 | 23.9 | 2.31 | ||
| Specialty | General/family practice | 68.1 | 0.17 | 84.1 | 0.00 | <0.0001 |
| Cardiology | 8.7 | 0.04 | 1.8 | 0.00 | ||
| Psychiatry | 13.6 | 0.07 | 9.8 | 0.00 | ||
| General Surgery | 9.7 | 0.05 | 4.3 | 0.00 | ||
| Country of graduation | Graduated from medical school in the country of survey (USA/Canada/UK) | 71.0 | 1.49 | 81.4 | 2.08 | <0.001 |
| Full-time working | ≥40 h/week | 73.8 | 1.42 | 57.0 | 2.67 | <0.001 |
↵* Analysis restricted to doctors working in primary care, cardiology, general surgery and psychiatry to allow comparison with the UK sample.
↵† Multiple regression analysis was based on 1148 responses, including an additional 70 doctors from an identical survey administered to doctors in training who had in fact become fully qualified by the time of the survey.