Value of color Doppler ultrasound in preoperative typing diagnosis of acute appendicitis

Table 1 Comparison of general characteristics and clinical features between two groups

Variable	Simple (n = 186)	Suppurative (n = 142)	Statistic	P value
Sex			χ2 = 0.18	0.671
Male	104 (55.9)	76 (53.5)
Female	82 (44.1)	66 (46.5)
Age (years)	31.8 ± 13.9	33.4 ± 14.6	t = 0.98	0.328
BMI (kg/m2)	23.6 ± 3.2	24.1 ± 3.5	t = 1.32	0.188
Pain duration (hour)	24.3 ± 12.6	36.8 ± 18.5	t = 6.98	< 0.001
Temperature (°C)	37.5 ± 0.6	38.2 ± 0.8	t = 8.56	< 0.001
WBC (× 109/L)	11.2 ± 2.8	14.8 ± 3.6	t = 9.82	< 0.001
Neutrophil (%)	78.4 ± 7.1	85.6 ± 6.2	t = 9.36	< 0.001
CRP (mg/L)	45.6 ± 18.7	82.5 ± 28.3	t = 13.24	< 0.001

Data was showed as n (%) or mean ± SD. Continuous variables compared using independent sample t-test; categorical variables compared using χ² test. BMI: Body mass index; WBC: White blood cell count; CRP: C-reactive protein.