Returns composite Sessler risk stratification index, given a list of ICD-9-CM codes.
ICD-9-CM codes must have periods removed. Diagnostic codes are prefixed with
'D' while procedure codes are prefixed with 'P'. So, diagnostic code
404.03 should be
a unique character vector of ICD-9-CM codes
Note: A subsequent publication (Sigakis, 2013) found the following: "Calibration "in-the-large" for RSI in-hospitalmortality illustrated a discrepancy between actual (1.5 identified a regression constant (-2.198) in the published RSI "all-covariates.xls" file that was not used in the published SPSS implementation macro."
The risk stratification index score
Tom Joseph <email@example.com>, Patrick McCormick <firstname.lastname@example.org>
1. Sessler DI, Sigl JC, Manberg PJ, Kelley SD, Schubert A, Chamoun NG. Broadly applicable risk stratification system for predicting duration of hospitalization and mortality. Anesthesiology. 2010 Nov;113(5):1026-37. doi: 10.1097/ALN.0b013e3181f79a8d.
2. Sigakis MJG, Bittner EA, Wanderer JP: Validation of a risk stratification index and risk quantification index for predicting patient outcomes: in-hospital mortality, 30-day mortality, 1-year mortality, and length-of-stay. Anesthesiology 2013; 119:525-40
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