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Table 1 The best parsimonious models for prediction of SSIs

From: Predicting postoperative surgical site infection with administrative data: a random forests algorithm

Model 1. The best parsimonious model of hospitalization diagnostic (ICD 10) codes

Effect

*AOR, 95% CI

Risk point

T81- Operative complication (infection, hemorrhage, etc.)

6.40 (5.08–8.01)

2

K65 - Peritonitis

5.87 (3.88–7.88)

1

B96 - Other bacterial agents causing infections

2.56 (1.84–3.47)

1

K83 - Biliary duct infection, obstruction, perforation

6.32 (4.42–8.01)

3

Y83 - Surgical operation/procedures as the cause of abnormal reaction of the patient/ or later complication

2.46 (1.97–3.07)

1

B95 – Streptococcus/ staphylococcus as the cause of diseases

3.25 (2.17–4.87)

1

Model 2. The best parsimonious model of physician diagnostic (ICD 9) codes

Effect

AOR, 95% CI

Risk point

686 - Pyoderma, pyogenic granuloma, other local infections

8.13 (6.50–9.20)

3

682- Cellulitis, abscess

4.70 (3.57–6.10)

2

998 - Other complications of procedures

5.68 (4.77–6.78)

2

556 - Ulcerative colitis

8.60 (6.31–9.18)

3

685 - Pilonidal cyst with fistula, abscess

2.69 (1.52–3.76)

2

560 - Intestinal obstruction without mention of hernia

2.97 (2.19–4.01)

2

154 - Malignant neoplasm of rectum, rectosigmoid junction

4.37 (3.29–5.17)

2

599 - Other disorders of urethra and urinary tract

2.04 (1.55–2.62)

1

153 - Malignant neoplasm of colon

2.71 (2.02–3.22)

1

Model 3. The best parsimonious model of physician procedure claims

Effect

AOR, 95% CI

Risk point

Z59 - Digestive system surgical procedure: colon/biliary tract

7.38 (6.08–9.09)

4

C46 - Infectious disease: hospital consult/assessment

5.77 (4.66–7.43)

3

Z10 - Skin/subcutaneous tissue: incision of abscess or hematoma

7.88 (6.04–8.67)

3

C03 - General surgery: hospital consult/assessment

3.45 (2.86–4.19)

2

H15 - Family practice: assessment on weekend

2.33 (1.80–3.01)

2

S16 - Digestive system surgical procedures: intestine

1.98 (1.48–2.52)

1

C20 - Obstetrics and gynecology assessment/consult

2.25 (1.66–3.05)

2

Z08 - Debridement of wound(s) and/or ulcer(s)

4.01 (2.83–5.56)

3

S21 - Digestive system surgical procedures: colon/rectum

2.65 (1.91–3.62)

2

R06 - Skin/subcutaneous tissue: free island flaps

4.64 (2.58–6.36)

3

C13 - Internal medicine: hospital assessment/consult

1.96 (1.52–2.36)

1

H13 - Family practice: assessment/consult on weekdays

2.85 (2.18–3.52)

2

C21 – Pain management: limited consultations

1.84 (1.55–2.10)

1

R11- Operations of the breast: incision, excision, repair

2.81 (1.02–3.41)

3

  1. *AOR, 95% CI = Adjusted Odds Ratio, 95% Confidence Interval