| Pathology |
| Appendicitis | 65 (82.3%) | 66 (83.5%) | 1 | − 0.17 |
| Non-appendicitis | 14 (17.7%) | 13 (16.5%) |
| USG appendicitis |
| Positive | 57 (72.2%) | 38 (48.1%) | 0.002 | 0.246 |
| Negative | 22 (27.8%) | 41 (51.9%) |
| Pain severity |
| Mild | 1 (1.3%) | 17 (21.5%) | < 0.001 | 0.691 |
| Moderate | 21 (26.6%) | 54 (68.4%) |
| High | 57 (72.2%) | 5 (6.3%) |
| Severe | 0 (0%) | 3 (3.8%) |
| Pain outside the right lower quadrant |
| Positive | 5 (6.3%) | 11 (13.9%) | 0.186 | − 0.126 |
| Negative | 74 (93.7%) | 68 (86.1%) |
| Increased pain in follow-up |
| Positive | 25 (31.6%) | 35 (44.3%) | 0.101 | − 0.13 |
| Negative | 54 (68.4%) | 44 (55.7%) |
| The spread of pain from the umbilicus | | | | |
| Positive | 26 (32.9%) | 48 (60.8%) | < 0.001 | − 0.279 |
| Negative | 53 (67.1%) | 31 (39.2%) |
| Vomiting |
| Positive | 28 (35.4%) | 11 (13.9%) | 0.003 | 0.25 |
| Negative | 51 (64.6%) | 68 (86.1%) |
| Anorexia |
| Positive | 31 (39.2%) | 48 (60.8%) | 0.007 | − 0.215 |
| Negative | 48 (60.8%) | 31 (39.2%) |
| Duration of symptoms |
| < 24 h | 60 (75.9%) | 23 (29.1%) | < 0.001 | 0.471 |
| 24–48 h | 12 (15.2%) | 40 (50.6%) |
| > 48 h | 7 (8.9%) | 14 (20.3%) |
| Right lower quadrant pain with cough |
| Positive | 36 (45.6%) | 48 (60.8%) | 0.560 | − 0.152 |
| Negative | 43 (54.4%) | 31 (39.2%) |
| Bowel sounds |
| Increased/metallic | 1 (1.3%) | 4 (5.1%) | < 0.001 | 0.537 |
| Normal | 39 (49.4%) | 73 (94.2%) |
| Absent | 39 (49.4%) | 2 (2.5%) |
| Defense |
| Absent | 0 (0%) | 24 (30.4%) | < 0.001 | 0.693 |
| Mild | 1 (1.3%) | 10 (12.7%) |
| Moderate | 26 (32.9%) | 41 (51.9%) |
| Severe | 52 (65.8%) | 4 (5.1%) |
| Right lower quadrant sensitivity |
| Positive | 79 (100%) | 78 (98.7%) | 1 | 0.08 |
| Negative | 0 (0%) | 1 (1.3%) |
| Rebound |
| Positive | 75 (94.8%) | 58 (73.4%) | < 0.001 | 0.295 |
| Negative | 4 (5.1%) | 21 (26.6%) |
| Rovsing’s sign |
| Positive | 37 (46.8%) | 16 (20.3%) | 0.001 | 0.282 |
| Negative | 42 (53.2%) | 63 (79.7%) |
| Pyrexia |
| Positive | 16 (20.3%) | 12 (15.2%) | 0.532 | 0.066 |
| Negative | 63 (79.7%) | 67 (84.8%) |
| Left shift in neutrophils |
| Positive | 47 (59.5%) | 23 (29.1%) | < 0.001 | 0.306 |
| Negative | 32 (40.5%) | 56 (70.9%) |
| Negative urinalysis |
| Positive | 79 (100%) | 44 (55.7%) | < 0.001 | 0.533 |
| Negative | 0 (0%) | 35 (44.3%) |
| Follow-up time |
| 1 day | 69 (87.3%) | 53 (67.1%) | 0.003 | 0.247 |
| 2 days | 9 (11.4%) | 25 (31.6%) |
| 3 days | 1 (1.3%) | 1 (1.3%) |
