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Table 5 Comparison of subject demographics between the two groups

From: Should preoperative computed tomography be routine examination for cervicofacial space infections?

Study variables All Preoperative CT Non-preoperative CT T/χ2 P-value
Sample size, n (%) 153 (100%) 108 (70.6) 45 (29.4) NA NA
Age (year),
mean ± SD
51.7 ± 17.4 53.3 ± 17.2 47.9 ± 17.6 1.75 0.08
Gender, n (%)      
 Women 59 (38.6) 42 (38.9) 17 (37.8) 0.02 0.9
 Men 94 (61.4) 66 (61.1) 28 (62.2)   
Diabetes mellitus, n (%)      
 Yes 19 (12.4) 14 (13.0) 5 (11.1) 0.1 0.75
 No 134 (87.6) 94 (87.0) 40 (88.9)   
WBC > 10.0 × 109/L, n (%)      
 Yes 131 (85.6) 91 (84.3) 40 (88.9) 0.55 0.46
 No 22 (14.4) 17 (15.7) 5 (11.1)   
Tracheotomy received before surgery, n (%)      
 Yes 11 (7.2) 9 (8.3) 2 (4.4) 0.26a 0.61
 No 142 (92.8) 99 (91.7) 43 (95.6)   
“Red flag” signs, n (%)      
 Yes 61 (39.9) 46 (42.6) 15 (33.3) 1.14 0.29
 No 92 (60.1) 62 (57.4) 30 (66.7)   
Involved deep spaces ≥ 2, n (%)      
 Yes 57 (37.3) 41 (38.0) 16 (35.6) 0.08 0.78
 No 96 (62.7) 67 (62.0) 29 (64.4)   
Pearson χ2 test, continuity χ2 test, and Student-t test were used for analysis
“Red flag” signs: either dyspnea, the elevated floor of mouth, or dysphagia presented
NA not applicable, SD standard deviation, WBC white blood cell count
aContinuity χ2 test