Table 2. Baseline characteristics of stone formers with and without a 24-hour urine collection.
| Characteristics | With 24-hour | Without 24-hour | p-value |
|---|---|---|---|
| (n = 19,288) | (n = 111,201) | ||
| Age (mean ± SD, years) | 58.3 ± 12.5 | 61.2 ± 13.8 | <0.001 |
| Sex (n,%) | |||
| Male | 17,884 (92.7) | 105,541 (94.9) | <0.001 |
| Female | 1404 (7.3) | 5660 (5.1) | <0.001 |
| Race/Ethnicity | |||
| White | 15,331 (79.5) | 86,013 (77.4) | <0.001 |
| Black | 1760 (9.1) | 12,301 (11.1) | <0.001 |
| Other or unknown | 1864 (9.7) | 9900 (8.9) | <0.001 |
| Stone Diagnosis | |||
| Inpatient | 1525 (7.9) | 14,326 (12.9) | <0.001 |
| Outpatient | 13,607 (70.5) | 67,931 (61.1) | <0.001 |
| Procedure | 4156 (21.5) | 28,944 (26) | <0.001 |
| Stone procedures (median, IQR) | 1 (0–2) | 0 (0–1) | <0.001 |
| Charlson Comorbidity Index (mean ± SD) | 2.1 ± 2.3 | 2.5 ± 2.6 | |
| Individual Conditions (n,%) | |||
| CVDa | 6405 (33.2) | 47,577 (42.8) | <0.001 |
| Diabetes Mellitus | 6042 (31.3) | 35,528 (31.9) | 0.08 |
| Cancer | 2580 (13.4) | 21,527 (19.1) | <0.001 |
| Paralysis | 574 (3.0) | 3527 (3.2) | 0.15 |
| COPD | 4617 (23.9) | 29,578 (26.6) | <0.001 |
| Dementia | 365 (1.9) | 4202 (3.8) | <0.001 |
| Hyperparathyroidism | 493 (2.6) | 324 (0.3) | <0.001 |
aCVD: includes cardiovascular disease, myocardial infarction, heart failure and peripheral vascular disease