Table 1.
Characteristics of the study population
| Characteristics | Overall (N = 74) | Torino sample (n = 54) | Tufts sample (n = 20) |
|---|---|---|---|
| Age (years), mean (SD) | 46.7 (12.3) | 44.5 (12.0) | 52.7 (11.2) |
| Female, n (%) | 25 (34) | 15 (28) | 10 (50) |
| Weight (kg), mean (SD) | 77.7 (21.4) | 74.4 (18.5) | 86.5 (26.2) |
| BMI (kg/m2), mean (SD) | 26.3 (6.1) | 25.1 (4.9) | 29.8 (7.6) |
| Potassium citrate, n (%) | 14 (19) | 10 (19) | 4 (20) |
| Thiazides, n (%) | 10 (14) | 0 (0) | 10 (50) |
| Stone composition, n (%) | |||
| CaOx | 18 (24) | 8 (15) | 8 (40) |
| CaP | 4 (5) | 2 (4) | 1 (5) |
| Mixed CaOx/CaP | 18 (24) | 10 (19) | 7 (35) |
| Other | 4 (5) | 4 (7) | 0 (0) |
| Not known | 50 (68) | 30 (56) | 4 (20) |
| Creatinine (mg/24 hour), median (IQR) | 1511 (1210–1933) | 1455 (1210–1933) | 1706 (1178–1908) |
| Oxalate (mg/24 hour), median (IQR) | 34.7 (24.8–44.5) | 35.5 (27.5–45.3) | 33.1 (23.0–41.0) |
| Calcium (mg/24 hour), median (IQR) | 165 (101–219) | 163 (89–242) | 171 (134–203) |
| Magnesium (mg/24 hour), median (IQR) | 94 (68–121) | 94 (68–119) | 92 (69–141) |
| Citrate (mg/24 hour), median (IQR) | 507 (338–718) | 507 (357–702) | 501 (327–750) |
| Uric acid (mg/24 hour), median (IQR) | 551 (437–696) | 527 (437–683) | 599 (450–728) |
| SS CaOx–median (IQR) | 4.6 (2.6–7.0) | 4.8 (2.2–7.8) | 4.3 (3.1–5.9) |
| SS CaP, median (IQR) | 0.7 (0.2–1.7) | 0.7 (0.2–2.5) | 0.7 (0.3–1.1) |
| SS UA, median (IQR) | 0.4 (0.2–1.0) | 0.4 (0.3–0.9) | 0.4 (0.1–1.1) |
BMI, body mass index; CaOx, calcium oxalate; CaP, calcium phosphate; SS, supersaturation; UA, uric acid.