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Exhibit 27. Summary of missing data

ValueNon-SSI PatientsSSI Patients
abx_dc1970 (8%)27 (11%)
admit_src643 (3%)9 (4%)
age642 (3%)13 (6%)
asa18954 (76%)170 (72%)
bmi4320 (17%)27 (11%)
ca_hx*0 (0%)0 (0%)
ch_kidney_dx*0 (0%)0 (0%)
ch_lung_dx*0 (0%)0 (0%)
copd_hx*0 (0%)0 (0%)
diabetes*0 (0%)0 (0%)
general_anes8 (0%)0 (0%)
hypocholest*0 (0%)0 (0%)
postop_hematocrit7597 (31%)40 (17%)
postop_hemoglob9540 (38%)57 (24%)
preop_albumin17468 (70%)143 (61%)
preop_hematocrit10220 (41%)73 (31%)
preop_hemoglob10709 (43%)79 (34%)
preop_stay1002 (4%)14 (6%)
rheum_dx*0 (0%)0 (0%)
sex13 (0%)0 (0%)
surg_dur614 (2%)13 (6%)
wnd_class1128 (5%)34 (14%)

* Unable to determine extent of missing data; original data dictionary instructed data abstractors to send specific ICD-9 codes if condition was present or leave blank if condition was not present.

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Page last reviewed December 2012
Internet Citation: Exhibit 27. Summary of missing data. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh27.html