Table 1.
Characteristics of SSc cases and non-cases in the training set
| Characteristics | SSc cases (n = 86) | Non-cases (n = 94) | p value1 |
|---|---|---|---|
| Age, years, mean ± standard deviation | 68 ± 14 | 59 ± 20 | < 0.01 |
| Female, n (%) | 71 (83%) | 84 (89%) | 0.19 |
| White, n (%) | 65 (76%) | 70 (75%) | 0.86 |
| Number of counts of the SSc ICD-92 code (710.1), mean ± standard deviation | 10 ± 16 | 2 ± 5 | < 0.01 |
| Number of counts of the SSc ICD-10-CM3 codes (M34*), mean ± standard deviation | 6 ± 7 | 2 ± 8 | < 0.01 |
| Years of follow-up4, mean ± standard deviation | 7 ± 6 | 10 ± 7 | < 0.01 |
1Mann-Whitney U test for continuous variables and chi-square test for categorical variables
2ICD-9 International Classification of Diseases, Ninth Revision
3ICD-10-CM International Classification of Diseases, Tenth Revision, Clinical Modification
4Years of data available in the electronic health record from first to last ICD-9 and/or ICD-10-CM codes for any conditions