Table 1.
Population characteristics
| Characteristics | Participants with Kidney Stones (n=44) | Controls (n=44) |
|---|---|---|
| Median age at enrollment, yr (IQR) | 15.6 (11.8, 17.1) | 15.6 (12.4, 16.5) |
| Median age at first stone, yr (IQR) | 13 (8.5, 15) | N/A |
| Sex, no. (%) | ||
| Male | 21 (47.7) | 21 (47.7) |
| Female | 23 (52.3) | 23 (52.3) |
| Ethnicity, no. (%) | ||
| Hispanic or Latino | 3 (6.8) | 2 (4.5) |
| Not Hispanic or Latino | 40 (90.9) | 42 (95.5) |
| Missing | 1 (2.3) | 0 |
| Race, no. (%) | ||
| Black | 1 (2.3) | 2 (4.5) |
| White | 43 (97.7) | 40 (90.9) |
| Multiple | 0 | 2 (4.5) |
| Median body mass index, percentile (IQR) | 67.6 (28.5, 91.8) | 61.4 (40.3, 80.1)a |
| Stone activity, no. (%)b | ||
| Quiescent | 21 (47.7) | N/A |
| Active | 23 (52.3) | N/A |
| Recurrent, no. (%)c | ||
| No | 18 (40.9) | N/A |
| Yes | 26 (59.1) | N/A |
| Family history, no. (%) | ||
| No | 14 (31.8) | N/A |
| Yes | 30 (68.2) | N/A |
IQR, interquartile range; N/A, not applicable.
a
Three missing, n=41.
b
Quiescent is the absence of growth of an existing stone and no formation of a new stone in the year before specimen collection. Active is the growth of an existing stone or formation of a new stone in the year before specimen collection.
c
Recurrent stone formers are participants with a new symptomatic stone or new stone formation on imaging between their first stone and the date of specimen collection.