Influence of Institution-Based Factors on Preoperative Blood Testing Prior to Low-Risk Surgery: A Bayesian Generalized Linear Mixed Approach

Table 1

Patient characteristics.

Characteristics
	69,252
Age, yr
<25	3,070 (4.4)
25–34	13,172 (19.0)
35–44	19,816 (28.6)
45–54	18,281 (26.4)
55–64	14,913 (21.5)
Sex, female	39,489 (57.0)
CCI score
0-1	57,106 (82.5)
2	6,742 (9.7)
≥3	5,404 (7.8)
Medication
Antiplatelet	1,759 (2.5)
Anticoagulant	330 (0.5)
ACEI/ARB	5,399 (7.8)
Diuretics	1,075 (1.6)
Chemotherapy	792 (1.1)
Type of anesthesia
General anesthesia	8,824 (12.7)
Regional anesthesia	7,291 (10.5)
Sedation	7,802 (11.3)
Local anesthesia	38,874 (56.1)
Unknown	6,461 (9.3)
Surgical setting
Inpatient	21,496 (31.0)
Outpatient	47,756 (69.0)
Teaching hospital	5,372 (7.8)
Number of beds
<100	41,157 (59.4)
≥100	28,095 (40.6)

ACEI, angiotensin-converting enzyme inhibitor; ARB, angiotensin-receptor blocker; CCI, Charlson comorbidity index.