Preoperative risk modelling for oesophagectomy: A systematic review

Table 4 Methodological quality (overall performance) for preoperative models

Model	Study participation (out of 8)	Measurements (out of 4)	Analysis (out of 8)	Total (out of 20)
PNI	N/A	N/A	N/A	N/A
CCI	6	4	5	14
ACCI	6	4	4.5	14.5
GNRI	6.5	3	4.5	14
Cologne	7	3	4	14
Rotterdam	7.5	4	6	17.5
Philadelphia	7.5	4	5	16.5
Amsterdam	8	3.5	7	18.5
Original STS	8	4	5.5	17.5
Ferguson	7.5	4	5	16.5
NSQIP SRC	7.5	3.5	6	16.5
Takeuchi	8	3	7	18
PNI multivariate	8	4	7	19
Revised STS	8	4	4.5	16.5
PER	7	4	4	15
RAI-A	7	4	6.5	17.5
5 Factor MFI	6.5	3	6.5	16
PPCS	7	4	5.5	16.5
JNCD	8	4	6.5	18.5
RAI-revised	7	4	8	19
RAI-revised (CC)	8	4	6.5	18.5

CCI: Charlson comorbidity index; ACCI: Age-adjusted charlson comorbidity index; GNRI: Geriatric nutritional risk index; NSQIP SRC: National Surgical Quality Improvement Program Surgical Risk Calculator; RAI-A: Administrative risk analysis index; MFI: Modified frailty index; STS: Society of Thoracic Surgeons Oesophagectomy Composite Score; PNI: Prognostic nutritional index; PPCS: Predicting postoperative complications score; JNCD: Japanese National Clinical Database; PER: Perioperative esophagectomy risk score.