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Table 1 Patient characteristics

From: The surgical wound in infrared: thermographic profiles and early stage test-accuracy to predict surgical site infection in obese women during the first 30 days after caesarean section

Categorical factor Frequency (valid %)
SSI (n = 14) Non-SSI (n = 36) All patients (n = 50)
Procedure
 Planned 6 (42.9%) 14 (38.9%) 20 (40.0%)
 Emergency 8 (57.1%) 22 (61.1%) 30 (60.0%)
Ethnicity
 White British 13 (92.9%) 25 (69.4%) 38 (76.0%)
 Non-White British 1 (7.1%) 11 (30.6%) 12 (24.0%)
Number of pregnancies
 1 2 (14.3%) 14 (38.9%) 16 (32.0%)
 2 4 (28.6%) 7 (19.4%) 11 (22.0%)
 3 5 (35.7%) 7 (19.4%) 12 (24.0%)
 4 1 (7.1%) 5 (13.9%) 6 (12.0%)
 5 0 (0.0%) 2 (5.6%) 2 (4.0%)
 6 1 (7.1%) 1 (2.8%) 2 (4.0%)
 7 or more 1 (7.1%) 0 (0.0%) 1 (2.0%)
Number of live births
 1 2 (14.3%) 18 (50.0%) 20 (40.0%)
 2 10 (71.4%) 6 (16.7%) 16 (16.7%)
 3 1 (7.1%) 7 (19.4%) 8 (16.0%)
 4 0 (0.0%) 4 (11.1%) 4 (8.0%)
 5 0 (0.0%) 1 (2.8%) 1 (2.0%)
 6 0 (0.0%) 0 (0.0%) 0 (.0.0%)
 7 or more 1 (7.1%) 0 (0.0%) 1 (2.0%)
Number of C-sections (n = 49)
 1 5 (38.5%) 25 (69.4%) 30 (61.2%)
 2 6 (46.2%) 7 (19.4%) 13 (26.5%)
 3 2 (15.4%) 2 (5.6%) 4 (8.2%)
 4 0 (0.0%) 2 (5.6%) 2 (4.1%)
Variable Mean (SD)
SSI (n = 14) Non-SSI (n = 36) All patients (n = 50)
Number of C-sections (n = 49) 1.77 (0.725) 1.47 (0.845) 1.55 (0.818)
Blood loss (ml) (n = 50) 472 (149) 692 (364) 630 (332)
Pre-operative haemoglobin (g/L) (n = 49) 114 (8.03) 119 (13.7) 117 (12.5)
Post-operative haemoglobin (g/L) (n = 43) 101.4 (8.73) 101 (11.8) 101 (11.0)
Pre-operative white blood cell count (×109/L) (n = 48) 10.7 (3.91) 11.1 (3.87) 11.0 (3.84)
Post-operative white blood cell count (× 109/L (n = 46) 10.9 (5.09) 13.1 (3.81) 12.5 (4.23)
Gestational age (weeks) 39.7 (1.28) 39.2 (1.67) 39.4 (1.53)
Body mass index (kg.m−2) 35.2 (3.89) 35.3 (3.99) 35.3 (3.92)
Body temperature (°C) (n = 50) 36.8 (0.31) 36.8 (0.25) 36.8 (0.26)
Abdominal temperature Day 2 (°C) (n = 50) 33.4 (0.79) 33.8 (0.80) 33.7 (0.81)
Wound temperature Day 2 (°C) (n = 50) 35.1 (0.53) 34.9 (0.69) 35.0 (0.65)
Abdominal temperature Day 7 (°C) (n = 47) 32.5 (0.98) 33.5 (0.98) 33.2 (1.07)
Wound temperature Day 7 (°C) (n = 47) 34.4 (0.77) 34.5 (0.80) 34.5 (0.78)
Abdominal temperature Day 15 (°C) (n = 44) 31.7 (1.87) 32.6 (1.01) 32.3 (1.36)
Wound temperature Day 15 (°C) (n = 44) 33.7 (1.11) 34.1 (0.86) 34.0 (0.95)
Wound minus abdominal temperature difference Day 2 (°C) 1.73 (0.96) 1.12 (0.77) 1.29 (0.86)
Wound minus abdominal temperature difference Day 7 (°C) (n = 47) 1.92 (1.00) 1.09 (1.01) 1.34 (1.07)
Wound minus abdominal temperature difference Day 15 (°C) (n = 44) 1.96 (1.59) 1.56 (1.29) 1.68 (1.36)