Table 3.
Top ten features with the highest important scores of the best performance XGBoost case definition
| Feature | Code Description | Data type | Importance score |
|---|---|---|---|
| One occurrence of text “rheumatoid arthritis” | Billing, encounter diagnosis or problem list | 0.2395 | |
| One occurrence of text “rheumatoid” | Billing, encounter diagnosis or problem list | 0.1461 | |
| Two occurrences of text “rheumatoid” | Billing, encounter diagnosis or problem list | 0.0562 | |
| Two occurrences of text “arthritis” | Billing, encounter diagnosis or problem list | 0.0297 | |
| Two occurrences of text “rheumatoid” in 24 months | Billing, encounter diagnosis or problem list | 0.0295 | |
| Two occurrences of text “other inflammatory” | Billing, encounter diagnosis or problem list | 0.0228 | |
| One ATC code P01BA02 | Hydroxychloroquine | Medication | 0.0225 |
| Two occurrences of text “arthritis” | Problem list | 0.0224 | |
| One ATC code B03BB01 | Folic acid | Medication | 0.0197 |
| Two occurrences of text “rheumatoid arthritis” in 24 months | Billing, encounter diagnosis or problem list | 0.0189 |
“Or any sub-codes” means all codes starting with the same characters (e.g., B03 (or any sub-codes) includes B03A, B03B, B03BB, etc.)
ATC Anatomical Therapeutic Chemical (ATC) Classification, ICD-9 International Classification of Diseases, Ninth Revision