Table 1.
Characteristics of Pediatric Urolithiasis Cases and Matched Controls
| Cases (Urolithiasis) n=9,843 |
Controls (No Urolithiasis) n=39,047 |
|
|---|---|---|
| Age | 12.1±4.7 | 12.1±4.7 |
| <1yr | 321 (3.3%) | 1268 (3.3%) |
| 1–5yr | 643 (6.5%) | 2548 (6.5%) |
| 5–13yr | 3,856 (39.2%) | 15,301 (39.2%) |
| 13–18yr | 5,023 (51.0%) | 19,930 (51.0%) |
| Gender (%) | ||
| Male | 4,481 (45.5%) | 20,562 (52.7%) |
| Female | 5,362 (54.5%) | 23,887 (47.3%) |
| Race/Ethnicity | ||
| White | 6,668 (67.7%) | 19,610 (50.2%) |
| Black | 701 (7.1%) | 8,423 (21.6%) |
| Hispanic | 1,266 (12.9%) | 5,463 (14.0%) |
| Other | 471 (4.8%) | 2,631 (6.7%) |
| Missing | 737 (7.5%) | 2,920 (7.5%) |
| Insurance | ||
| Private | 6,603 (67.0%) | 23,887 (61.2%) |
| Public | 3,133 (33.0%) | 14,674 (38.8%) |
| Total Number of Visits to PHIS hospital | ||
| One | 3,159 (32%) | 19,780 (51%) |
| Two | 1,900 (19%) | 7,819 (20%) |
| Three | 1,240 (13%) | 3,883 (10%) |
| Four or more | 3,544 (36%) | 7,565 (19%) |
| Year | ||
| 2004 | 1495 (15%) | 5963 (15%) |
| 2005 | 1474 (15%) | 5878 (15%) |
| 2006 | 1621 (16%) | 6451 (17%) |
| 2007 | 1689 (17%) | 6717 (17%) |
| 2008 | 1641 (17%) | 6530 (17%) |
| 2009 | 1923 (20%) | 7508 (19%) |
| Encounter type | ||
| Inpatient | 4230 (43%) | 16769 (43%) |
| Emergency Room | 3888 (39.5%) | 15441 (39.5%) |
| Ambulatory Surgery | 1137 (11.5%) | 4504 (11.5%) |
| Other (Observation, Clinic, Other) | 588 (6%) | 2333 (6%) |