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Table 1 Univariate analysis of clinical data on the AA types. (Derivation Sample: n = 382)

From: A clinical prediction model for complicated appendicitis in children younger than five years of age

Variables Complicated appendicitis (n = 244) Simple appendicitis (n = 138) P value
Demographic data
 Age (years)# 3.3(2.5,4.1) 4.4(4.1,4.8) < 0.001a
 Male:Female 141:103 83:55 0.667b
 BMI (kg/m2)# 23.8(18.3,29.6) 23.7(18.2,29.1) 0.692a
Pre-operative laboratory values
 WBC (*109/L)# 15.8 (13.9,18.7) 12.3 (9.9,15.0) < 0.001a
 NEUT (*109/L)# 11.8 (9.3,13.5) 9.6 (7.2,12.1) < 0.001a
 PN (%)# 79.5 (63.2,86.2) 79.0 (72.8,85.1) 0.534a
 MC (*109/L)# 0.88 (0.51,1.21) 0.88 (0.57,1.27) 0.561a
 LYMPH (*109/L)# 3.0 (2.3,5.7) 2.6 (1.9,3.4) < 0.001a
 PCT (ug/L)# 0.26 (0.08,1.41) 0.12 (0.05,0.42) < 0.001a
 CRP (mg/L)# 58.5 (20.2124.8) 35.1 (15.9,80.2) 0.002a
 PLT (*109/L)# 279.0 (236.0,331.0) 278.0 (243.5316.8) 0.663a
Clinical findings
 DS (hours)# 38 (24,84) 24 (12,49) < 0.001a
 Body temperature (°C)# 38.5 (37.6,38.8) 38.1 (37.6,38.7) < 0.001a
 Migration of pain to RLQ n (%) 96 (39.3) 16 (11.6) < 0.001b
 LRQ tenderness n (%) 196 (80.3) 119 (86.2) 0.163b
 Abdominal distention n (%) 111 (45.5) 36 (26.1) < 0.001b
 Rebound pain n (%) 155 (63.5) 28 (20.3) < 0.001b
 Nausea/ vomiting n (%) 139 (57.0) 17 (12.3) < 0.001b
 Anorexia n (%) 182 (74.6) 109 (79.0) 0.382b
 Constipation n (%) 23 (9.4) 22 (15.9) 0.069b
 Diarrhea n (%) 117 (48.0) 11 (8.0) < 0.001b
  1. #Values are presented as medians and inter-quartile ranges; aMann-Whitney U test; bChi-square test. BMI body mass index, WBC white blood cell count, NEUT neutrophil count, PN percentage of neutrophils, MC mononuclear cell count, LYMPH lymphocyte count, PCT procalcitonin, CRP C-reactive protein, PLT platelet count, DS duration of symptoms, LRQ right lower quadrant