Table 1.
Patient characteristics
| 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 |
TP true positive, FP false positive, N number of patients; Significant at p < 0.05