Table 3. Clinical diagnosis, procedure and pharmacy variables included in the model, coefficients and variance inflation factors (VIF).
The intercept has no VIF because it is a constant and does not vary across the observations due to age/gender matching. The specific ICD-9 codes for diagnosis and CPT-4 codes for procedures used to identify these variables are shown in parenthesis.
| Type | Variable Description | Coefficient | Pr(>|Z|) | VIF |
|---|---|---|---|---|
| INTERCEPT (MALE, 65–69) | -1.96 | <0.0001 | ||
| ICD-9-CM | MEMORY LOSS (780.93) | 1.33 | <0.0001 | 1.02 |
| PARALYSIS AGITANS (332.0) | 1.17 | <0.0001 | 1.01 | |
| MILD COGNITIVE IMPAIRMENT, SO STATED (331.83) | 1.14 | <0.0001 | 1.01 | |
| BIPOLAR DISORDER, UNSPECIFIED (296.80) | 1.00 | <0.0001 | 1.01 | |
| UNSPECIFIED PSYCHOSIS (298.9) | 0.44 | <0.0001 | 1.06 | |
| LOSS OF WEIGHT (783.21) | 0.42 | <0.0001 | 1.02 | |
| DEPRESSIVE DISORDER, NOT ELSEWHERE CLASSIFIED (311) | 0.37 | <0.0001 | 1.10 | |
| ALTERED MENTAL STATUS (780.97) | 0.33 | <0.0001 | 1.16 | |
| PERSONAL HISTORY OF FALL (V15.88) | 0.32 | <0.0001 | 1.05 | |
| OTHER CONVULSIONS (780.39) | 0.32 | <0.0001 | 1.04 | |
| UNSPECIFIED FALL (E888.9) | 0.27 | <0.0001 | 1.06 | |
| OTHER CHRONIC PAIN (338.29) | 0.28 | <0.0001 | 1.03 | |
| ACUTE, BUT ILL-DEFINED, CEREBROVASCULAR DISEASE (436) | 0.24 | <0.0001 | 1.33 | |
| URGE INCONTINENCE (788.31) | 0.24 | <0.0001 | 1.07 | |
| OTHER ALTERATION OF CONSCIOUSNESS (780.09) | 0.23 | <0.0001 | 1.09 | |
| UNSPECIFIED CONSTIPATION (564.00) | 0.21 | <0.0001 | 1.05 | |
| UNSPECIFIED URINARY INCONTINENCE (788.30) | 0.21 | <0.0001 | 1.08 | |
| ENCOUNTER FOR LONG-TERM (CURRENT) USE OF OTHER MEDICATIONS (V58.69) | 0.17 | <0.0001 | 1.03 | |
| LACK OF COORDINATION (781.3) | 0.15 | <0.0001 | 1.09 | |
| OTHER MALAISE AND FATIGUE (780.79) | 0.11 | <0.0001 | 1.15 | |
| DIABETES MELLITUS (250.02) | 0.12 | <0.0001 | 1.30 | |
| ABNORMALITY OF GAIT (781.2) | 0.10 | <0.0001 | 1.20 | |
| DIZZINESS AND GIDDINESS (780.4) | 0.11 | <0.0001 | 1.13 | |
| UNSPECIFIED CEREBRAL ARTERY OCCLUSION WITH CEREBRAL INFARCTION (434.91) | 0.11 | 0.0083 | 1.35 | |
| DIABETES MELLITUS (250.00) | 0.07 | <0.0001 | 1.42 | |
| EDEMA (782.3) | 0.07 | <0.0001 | 1.10 | |
| MUSCLE WEAKNESS (GENERALIZED) (728.87) | 0.06 | 0.0277 | 1.14 | |
| URINARY TRACT INFECTION, SITE NOT SPECIFIED (599.0) | 0.03 | 0.0526 | 1.12 | |
| CPT | SCREENING MAMMOGRAPHY; COMPUTER-AIDED DETECTION (77052) | -0.25 | <0.0001 | 1.03 |
| COMPUTED TOMOGRAPHY, HEAD OR BRAIN (70450) | 0.16 | <0.0001 | 1.42 | |
| RADIOLOGIC EXAMINATION, CHEST; SINGLE VIEW, FRONTAL (71010) | 0.05 | 0.0011 | 1.28 | |
| Medication (HICL Description) | VENLAFAXINE HCL | 0.52 | <0.0001 | 1.02 |
| DULOXETINE HCL | 0.45 | <0.0001 | 1.05 | |
| TOLTERODINE TARTRATE | 0.32 | <0.0001 | 1.07 | |
| SERTRALINE HCL | 0.29 | <0.0001 | 1.05 | |
| CITALOPRAM HYDROBROMIDE | 0.25 | <0.0001 | 1.06 | |
| POTASSIUM CHLORIDE | 0.24 | <0.0001 | 1.35 | |
| OXYBUTYNIN CHLORIDE | 0.22 | 0.0001 | 1.08 | |
| HYDROCODONE BIT/ACETAMINOPHEN | 0.19 | <0.0001 | 1.27 | |
| PROPOXYPHENE/ACETAMINOPHEN | 0.15 | <0.0001 | 1.09 | |
| SULFAMETHOXAZOLE/TRIMETHOPRIM | 0.15 | <0.0001 | 1.12 | |
| METFORMIN HCL | 0.13 | 0.0001 | 1.40 | |
| BLOOD SUGAR DIAGNOSTIC | 0.12 | 0.0011 | 1.38 | |
| LISINOPRIL | 0.11 | <0.0001 | 1.17 | |
| CEPHALEXIN MONOHYDRATE | 0.10 | 0.0003 | 1.12 | |
| SIMVASTATIN | 0.10 | <0.0001 | 1.17 | |
| CLOPIDOGREL BISULFATE | 0.09 | 0.0054 | 1.11 | |
| TRAMADOL HCL | 0.09 | 0.0097 | 1.13 | |
| GABAPENTIN | 0.07 | 0.0914 | 1.12 | |
| FUROSEMIDE | 0.00 | 0.9396 | 1.46 |