Table 2: Univariate and multivariable logistic regression models of predictors of concurrent ordering of ANA and at least one subserology.

Variable OR 95% CI p-Value OR 95% CI p-Value
Age 1.00 0.99 1.01 0.655 1.01 0.99 1.02 0.457
Sex, male 0.42 0.29 0.60 <0.0001 0.32 0.21 0.49 <0.0001
Setting in which ANA ordered
Outpatient REF REF
Lab Draw Alone 0.43 0.19 0.98 0.044 0.92 0.38 2.22 0.853
Emergency or Urgent Care 1.69 0.59 4.81 0.324 1.31 0.38 4.50 0.672
Inpatient 1.20 0.16 9.27 0.859 0.92 0.10 8.18 0.940
Service that Ordered the ANA
Primary Care REF REF
Subspecialty Care 6.36 4.41 9.18 <0.0001 8.12 5.27 12.50 <0.0001
Other* 4.22 2.37 7.53 <0.0001 3.86 1.78 8.38 0.001
Race/Ethnicity
Hispanic REF REF
Caucasian 1.16 0.82 1.63 0.409 0.96 0.63 1.45 0.839
African American 1.38 0.97 1.96 0.077 1.44 0.94 2.22 0.097
Other/Unknown 1.28 0.71 2.31 0.405 0.93 0.45 1.93 0.852
Primary Payment Source
Medically Indigent REF REF
Medicaid 1.05 0.71 1.55 0.802 0.93 0.59 1.44 0.735
Medicare 1.63 1.07 2.47 0.022 1.26 0.76 2.11 0.368
Commercial Insurance 1.43 0.90 2.27 0.130 1.54 0.86 2.75 0.144
Self-pay 1.98 0.76 5.15 0.160 2.41 0.85 6.86 0.098
Other/Unknown 2.35 0.81 6.86 0.118 2.81 0.87 9.11 0.084

* Other: includes emergency/urgent care, inpatient care.
  Other* 200 6.9  

* Other: includes emergency/urgent care, inpatient care. Variable included in the multivariable model if p-value <=0.2 in the univariate model; variable considered significant in the multivariable model if the p-value <=0.05.