Table 1.
Patient characteristics of recurrent stone formers who report initial stone episode prior to age 20 compared to recurrent stone formers with initial episode after age 20.
| Patient Characteristics by Age of Initial Stone Episode | |||
|---|---|---|---|
| Initial stone before age 20 (n = 66) | Initial stone after age 20 (n = 406) | p value | |
| Average age at enrollment | 35 | 57 | p < 0.001 |
| Gender | |||
| Male | 41% | 58% | p = 0.011 |
| Female | 59% | 42% | |
| Race | |||
| Caucasian | 71% | 67% | p = 0.572 |
| Other | 29% | 33% C | |
| BMI | |||
| >30 | 23% | 34% | p = 0.088 |
| <30 | 77% | 66% | |
| Family History | |||
| Yes | 45% | 42% | p = 0.688 |
| No | 55% | 58% | |
| Infectious symptoms | |||
| Present | 18% | 13% | p = 0.252 |
| Absent | 82% | 87% | |
| Stone recurrences | |||
| 1 prior episode | 26% | 40% | p = 0.028 |
| >1 prior episodes | 74% | 60% | |
| Comorbidities | |||
| Hypertension | 6.5% | 16.6% | p = 0.004 |
| Chronic Kidney Disease | 14.4% | 13.9% | p = 0.773 |
| Diabetes mellitus, type 2 | 6.0% | 15.3% | p = 0.054 |
| Diabetes mellitus, type 1 | 2.0% | 13.0% | p = 0.451 |