Improving the Measurement of Surgical Site Infection Risk Stratification/Outcome Detection

Exhibit 27. Summary of missing data

Value Non-SSI Patients SSI Patients
abx_dc 1970 (8%) 27 (11%)
admit_src 643 (3%) 9 (4%)
age 642 (3%) 13 (6%)
asa 18954 (76%) 170 (72%)
bmi 4320 (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_anes 8 (0%) 0 (0%)
hypocholest* 0 (0%) 0 (0%)
postop_hematocrit 7597 (31%) 40 (17%)
postop_hemoglob 9540 (38%) 57 (24%)
preop_albumin 17468 (70%) 143 (61%)
preop_hematocrit 10220 (41%) 73 (31%)
preop_hemoglob 10709 (43%) 79 (34%)
preop_stay 1002 (4%) 14 (6%)
rheum_dx* 0 (0%) 0 (0%)
sex 13 (0%) 0 (0%)
surg_dur 614 (2%) 13 (6%)
wnd_class 1128 (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. Content last updated December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh27.html