Table 4.
Top 10 ICD-9 code pairs based on temporal p value (≥1 day apart)
| Initial code (A)→subsequent code (B) | |||||
|---|---|---|---|---|---|
| Description (code A) | Description (code B) | Association χ2 | Association p value | Association OR | Temporal p value |
| Previous c-section, antepartum (654.23) | Previous c-section, delivered (654.21) | 643843.5 | <5×10−324 | 2281.5 | <5×10−324 |
| Bladder cancer (188.9) | History of bladder cancer (V10.51) | 554337.8 | <5×10−324 | 6004.6 | <5×10−324 |
| Normal delivery (650) | Delivery of single liveborn (V27.0) | 551713.8 | <5×10−324 | 253.9 | <5×10−324 |
| Unspecified breast disorder (611.9) | Screening for unspecified condition (V82.9) | 443371.9 | <5×10−324 | 442.1 | <5×10−324 |
| Second degree perineal laceration, delivered (664.11) | Routine postpartum follow-up (V24.2) | 388083.8 | <5×10−324 | 330.8 | <5×10−324 |
| Unspecified neoplasm of eyelid (173.1) | Unspecified disorder of eyelid (374.89) | 385374.2 | <5×10−324 | 1074.2 | <5×10−324 |
| Malignant neoplasm of female breast (174.9) | History of malignant breast cancer (V10.3) | 375502.6 | <5×10−324 | 549.9 | <5×10−324 |
| Allergic rhinitis due to pollen (477.0) | Allergic rhinitis due to animal hair (477.2) | 368401.3 | <5×10−324 | 705.2 | <5×10−324 |
| Chronic kidney disease (585) | Complication of kidney transplant (996.81) | 367000.7 | <5×10−324 | 554.1 | <5×10−324 |
| Symptoms associated with female genital organs (625.8) | Abnormal pap smear and cervical human papillomavirus (795.0) | 287914.0 | <5×10−324 | 202.3 | <5×10−324 |
ICD-9, International Classification of Diseases, Ninth Revision.