Table 2 Baseline demographics and clinical characteristics

Age (Mean, SD)

38.25 (19.33)

37.7 (19.28)

43.45 (19.05)

0.001^a

Sex (n, %)

0.212^b

 Female

638 (47.51%)

583 (48.06%)

55 (42.31%)

 Male

705 (52.49%)

630 (51.94%)

75 (57.69%)

Body Mass Index (Mean, SD)

22.86 (4.59)

22.82 (4.66)

23.19 (3.89)

0.315^a

Body temperature at triage (n, %)

0.235^b

 36–38 °C

1095 (81.53%)

994 (81.95%)

101 (77.69%)

  < 36 or > 38 °C

248 (18.47%)

219 (18.05%)

29 (22.31%)

Heart rate at triage (n, %)

0.121^b

  ≤ 90 bpm

655 (48.77%)

600 (49.46%)

55 (42.31%)

  > 90 bpm

688 (51.23%)

613 (50.54%)

75 (57.69%)

Respiratory rate at triage (n, %)

0.299^b

  ≤ 20 /min

1216 (90.54%)

1095 (90.27%)

121 (93.08%)

  > 20 /min

127 (9.46%)

118 (9.73%)

9 (6.92%)

Systolic blood pressure at triage (Mean, SD)

124.2 (20.32)

124.12 (20.25)

124.98 (21.08)

0.645^a

Diastolic blood pressure at triage (Mean, SD)

75.4 (22.02)

75.51 (22.68)

74.4 (14.47)

0.437^a

Pain score (VAS) (Mean, SD)

5.98 (1.81)

5.98 (1.76)

6 (2.21)

0.928^a

Abdominal pain duration (n, %)

0.001^b

  < 24 h

708 (52.72%)

659 (54.33%)

49 (37.69%)

 24-48 h

273 (20.33%)

241 (19.87%)

32 (24.62%)

  > 48 h

362 (26.95%)

313 (25.8%)

49 (37.69%)

Diagnostic tool

1.000^c

 Physical examination

2 (0.15%)

2 (0.17%)

0 (0%)

 CT

1315 (98.95%)

1187 (98.92%)

128 (99.22%)

 Ultrasound

10 (0.75%)

9 (0.75%)

1 (0.78%)

 MRI

2 (0.15%)

2 (0.17%)

0 (0%)

Diagnostic time (ER- > Exam) (h) (Mean, SD)

3.86 (2.79)

3.88 (2.8)

3.68 (2.68)

0.443^a

Time to surgery (ER- > OR) (h) (n, %)

0.536^b

  ≤ 12 h

593 (51.84%)

534 (52.15%)

59 (49.17%)

  > 12 h

551 (48.16%)

490 (47.85%)

61 (50.83%)

Operative time (min) (Mean, SD)

70.99 (32.46)

70.18 (32.58)

77.85 (30.68)

0.014^a

Operative method (n, %)

0.074^c

 Laparoscopic

1324 (98.73%)

1198 (98.93%)

126 (96.92%)

 Open

17 (1.27%)

13 (1.07%)

4 (3.08%)

White blood cell count (n, %)

0.677^b

 4000-12,000

456 (33.95%)

414 (34.13%)

42 (32.31%)

  < 4000 or > 12,000

887 (66.05%)

799 (65.87%)

88 (67.69%)

Neutrophil-Lymphocyte Ratio (Mean, SD)

10.47 (7.85)

10.32 (7.69)

11.94 (9.12)

0.055^a

Platelet-Lymphocyte Ratio (Mean, SD)

27.87 (21.39)

27.64 (21.45)

30.04 (20.73)

0.229^a

Systemic inflammatory response syndrome

0.037^b

 No

716 (53.31%)

658 (54.25%)

58 (44.62%)

 Yes

627 (46.69%)

555 (45.75%)

72 (55.38%)

Hospital stay in days (Mean, SD)

3.7 (3.45)

3.35 (2.09)

7 (8.4)

< 0.001^a

Disease severity

< 0.001^b

Non-perforation

942 (70.14%)

880 (72.55%)

62 (47.69%)

Perforation

401 (29.86%)

333 (27.45%)

68 (52.31%)