Level of clinical suspicion | Ultrasound | No Ultrasound | Risk ratio for harm (95% CI) | Risk ratio for benefit (95% CI) | Odds ratio (95% CI) | Risk difference (95% CI) |
---|---|---|---|---|---|---|
All | 21/314 (7%) | 25/315 (8%) | 0.84 (0.48 to 1.47) | 1.01 (0.97 to 1.06) | 0.83 (0.46 to 1.52) | -0.01 (-0.05 to 0.03) |
Strong | 7/95 (7%) | 11/89 (12%) | 0.60 (0.24 to 1.47) | 1.06 (0.96 to 1.16) | 0.56 (0.21 to 1.53) | -0.05 (-0.14 to 0.04) |
Moderate | 14/219 (6%) | 14/226 (6%) | 1.03 (0.50 to 2.11) | 1.00 (0.95 to 1.05) | 1.03 (0.48 to 2.22) | 0.00 (-0.04 to 0.05) |
Test of interaction1 | Â | Â | P = 0.35 | P = 0.29 | P = 0.34 | P = 0.30 |