Table 1 Patient Characteristics (n = 336)
|  | Labels | Appendicitis (n = 167) | Other AAP causes (n = 169) | P value |
|---|---|---|---|---|
ED Intake | ||||
Age |  | 33 (18.5–51.5) | 50 (27.0–68.0) | 0.000 |
Sex | Male | 43% | 36% | 0.274 |
Female | 57% | 64% | ||
Referrer | Primary Care Physician | 74% | 57% | 0.001 |
Self-referral | 21% | 37% | 0.001 | |
Hospital | 3% | 2% | 0.750 | |
Ambulance | 1% | 2% | 0.371 | |
Other Facility | 0% | 1% | 1.000 | |
Not reported | 2% | 1% | 0.370 | |
Pain Rating |  | 6 (3.5–8.0) | 6 (4.0–8.0) | 0.227 |
Vital Signs | ||||
Temperature [°C] |  | 37.3 (36.9–37.7) | 37.0 (36.6–37.3) | 0.000 |
Mean Arterial Pressure [mmHg] |  | 93 (85–100) | 100 (90–109) | 0.000 |
Heart Rate [bpm] |  | 82 (74–96.5) | 85 (74–99) | 0.730 |
Saturation [O2] |  | 99 (98–100) | 98 (96–100) | 0.004 |
Medical history | ||||
Development of complaints | Increase | 36% | 28% | 0.375 |
Decrease | 5% | 9% | ||
Unaltered | 4% | 4% | ||
Combination | 3% | 4% | ||
Not reported | 52% | 56% | ||
Vomiting | Â | 56% | 51% | 0.272 |
Anorexia | Â | 37% | 33% | 0.515 |
Fever | Â | 19% | 11% | 0.083 |
Movement Pain | Â | 20% | 10% | 0.013 |
Transportation Pain | Â | 45% | 28% | 0.002 |
Pain Migration | RLQ | 36% | 5% | 0.000 |
Flanks | 0% | 2% | 0.122 | |
Absent | 1% | 1% | 1.000 | |
Not reported | 63% | 91% | 0.000 | |
Pain Location | Right Lower Quadrant | 37% | 25% | 0.033 |
Left Lower Quadrant | 0% | 2% | 0.123 | |
Right Upper Quadrant | 1% | 3% | 0.448 | |
Epigastric Region | 4% | 5% | 1.000 | |
Hypogastric Region | 1% | 1% | 1.000 | |
Periumbilical | 16% | 12% | 0.344 | |
Diffuse | 8% | 7% | 0.540 | |
Combination | 26% | 30% | 0.596 | |
Physical Examination | ||||
Pain Location | Right Lower Quadrant | 38% | 16% | 0.000 |
Left Lower Quadrant | 1% | 3% | 0.215 | |
Right Upper Quadrant | 1% | 3% | 0.215 | |
Epigastric Region | 0% | 2% | 0.248 | |
Hypogastric Region | 0% | 1% | 1.000 | |
Periumbilical | 4% | 3% | 0.767 | |
Diffuse | 10% | 22% | 0.003 | |
Combination | 31% | 25% | 0.276 | |
Not Reported | 26% | 25% | 1.000 | |
McBurney’s Sign | Present | 58% | 15% | 0.000 |
Rebound Tenderness | Present | 38% | 20% | 0.000 |
Laboratory Test Results | ||||
C-Reactive Protein [mg/L] |  | 49.0 (14–118) | 20.5 (4–93.5) | 0.000 |
Neutrophils [x10^9/L] |  | 11.9 (± 4.9) | 8.8 (± 4.7) | 0.000 |
Leukocytes [x10^9/L] |  | 14.7 (± 5.0) | 11.7 (± 5.0) | 0.000 |
Potassium [mmol/L] |  | 3.8 (3.7–4.1) | 4.1 (3.7–4.3) | 0.001 |
Monocytes [x10^9/L] |  | 0.7 (0.5–1) | 0.6 (0.4–0.8) | 0.000 |
Protein in Urine | + | 11% | 7% | 0.196 |
++ | 4% | 4% | ||
+++ | 1% | 1% | ||
Negative | 59% | 53% | ||
Trace | 13% | 17% | ||
Not Reported | 11% | 20% | ||