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. 2022 May 10;28(1):95–101. doi: 10.1080/13814788.2022.2067142

Table 1.

Patient characteristics clinical features and CRP by diagnosis.

Characteristics Total study population (N = 1076) No appendicitis (N = 1006) Appendicitis (N = 70)
Male, n/total N (%) 459/1076 (42.7%) 412/1006 (41.0%) 47/70 (67.1%)
Age in years, median (IQR) 13.00 (IQR 6) 13.00 (IQR 4) 13.00 (IQR 6)
 4–8 years, N/total N (%) 190/1076 (17.7%) 184/1006 (18.3%) 6/70 (8.6%)
 9–12 years, N/total N (%) 303/1076 (28.2%) 281/1006 (27.9%) 22/70 (31.4%)
 13–18 years, N/total N (%) 583/1067 (54.2%) 541/1006 (53.8%) 42/70 (60.0%)
Clinical features, N/total N (%)    
 Symptoms
  Pain duration
   <24 h 229/823 (27.8%) 211/762 (27.7%) 18/61 (29.5%)
   24–48 h 78/823 (9.5%) 67/762 (8.8%) 11/61 (18.0%)
   48 h 516/823 (62.7%) 484/762 (63.5%) 32/61 (52.5%)
  Nausea/vomiting 384/575 (66.8%) 338/521 (64.9%) 46/54 (85.2%)
 Signs
  Reduced bowel sounds 70/578 (12.1%) 61/536(11.4%) 9/42 (21.4%)
  Peritoneal irritation 193/725 (26.6%) 153/664 (23.0%) 40/61 (65.6%)
  Tenderness RLQ 415/699 (59.4%%) 372/646 (57.6%) 43/53 (81.1%)
  Elevated temperature 227/718 (31.6%) 193/662 (29.2%) 34/56 (60.7%)
Investigations, median (IQR)
 CRP in mg/L (N = 1076) 5.00 (IQR: 2–12) 5.00 (IQR: 2–8) 42.00 (IQR: 18–83)

The numerator is the number of children in whom the feature is present; the denominator is the number of children in whom the feature is recorded. CRP: C-reactive protein; IQR: interquartile range.