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Table 1 Patient characteristics

From: Positive predictive value of ultrasound in correctly identifying an inguinal hernia: a single-centered retrospective pilot study

Parameter Complete study population TP ultrasound group FP ultrasound group Significance (TP vs FP)
N = 175 N = 159 N = 16
Sex     0.338
 Male 162 (92.6%) 148 (93.1%) 14 (87.5%)  
 Female 13 (7.4%) 11 (6.9%) 2 (12.5%)  
Age in years 57.1 ± 14.7 57.7 ± 14.9 50.9 ± 10.7 0.076
BMI 26.0 ± 3.4 25.8 ± 3.3 27.6 ± 4.2 0.043
Past abdominal surgery     0.403
 Yes 51 (29.1%) 48 (30.4%) 3 (17.6%)  
 No 124 (70.9%) 110 (69.6%) 14 (82.4%)  
Work experience ultrasound technician     0.348
Missing 58 51 7  
Total 117 108 9  
 < 5 years 37 (31.6%) 33 (30.5%) 4 (44.4%)  
 5–9 years 13 (11.1%) 11 (10.2%) 2 (22.2%)  
 10–14 years 44 (37.6%) 43 (39.8%) 1 (11.1%)  
 15–20 years 2 (1.7%) 2 (1.9%) 0 (0.0%)  
 > 20 years 21 (17.9%) 19 (17.6%) 2 (22.2%)  
Work experience radiologist     0.179
Missing 14 13 1  
Total 161 146 15  
 < 5 years 20 (12.4%) 19 (13.0%) 1 (6.7%)  
 5–9 years 1 (0.6%) 0 (0.0%) 1 (6.7%)  
 10–14 years 24 (14.9%) 20 (13.7%) 4 (26.6%)  
 15–20 years 51 (31.7%) 48 (32.9%) 3 (20.0%)  
 > 20 years 65 (40.4%) 59 (40.4%) 6 (40.0%)  
Hernia size in centimeters 1.37 ± 0.92 1.39 ± 0.94 1.13 ± 0 .51 0.919
Time between surgery and ultrasound in days 63.0 (42.0–81.0) 63.0 (41.0–84.0) 60.5 (42.0–76.8) 0.686
Operation technique     
 TEP 73 (41.7%) 70 (44.0%) 3 (18.8%)  
 TAPP 88 (50.3%) 78 (49.1%) 10 (62.5%)  
 Lichtenstein 10 (5.7%) 8 (5.0%) 2 (12.5)  
 Other 4 (2.3%) 3 (1.9%) 1 (6.3%)  
Postoperative complications 30 (17.1%) 28 (17.6%) 2 (12.5%) 0.557
  1. TP true positive, FP false positive, N number of patients; Significant at p < 0.05