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 | 126/314 (40%) | 159/315 (50%) | 0.79 (0.67 to 0.95) | 1.21 (1.05 to 1.40) | 0.66 (0.48 to 0.90) | -0.10 (-0.18 to -0.03) |
Strong | 65/95 (68%) | 86/89 (97%) | 0.71 (0.61 to 0.82) | 9.37 (2.96 to 29.62) | 0.08 (0.02 to 0.24) | -0.28 (-0.38 to -0.18) |
Moderate | 61/219 (28%) | 73/226 (32%) | 0.86 (0.65 to 1.15) | 1.07 (0.94 to 1.20) | 0.81 (0.54 to 1.21) | -0.04 (-0.13 to 0.04) |
Test of interaction1 | Â | Â | P = 0.14 | P < 0.001 | P < 0.001 | P < 0.001 |