Table 2.
Clinical characteristics of idiopathic CSFs with low (<5% papillary surface area) plaque and high (≥5% papillary surface area) plaque numbers
| CSFs With Low Plaque Numbers | CSFs With High Plaque Numbers | P Value | |
|---|---|---|---|
| Number of participants | 43 | 21 | |
| Age at urine collection | 62.5 (12.4) | 63.3 (11.6) | 0.75 |
| Sex | |||
| Female | 23 (53.5%) | 8 (38.1%) | |
| Male | 20 (46.5%) | 13 (61.9%) | |
| Body mass index, kg/m2 | 30.0 (6.8) | 29.2 (6.2) | 0.69 |
| Systolic blood pressure, mmHg | 127.0 (20.1) | 125.8 (18.1) | 0.66 |
| Diastolic blood pressure, mmHg | 68.5 (11.7) | 74.2 (13.8) | 0.09 |
| Urine calcium, mg/24 h | 205.5 (114.3) | 283.4 (145.5) | 0.03* |
| Urine chloride, mmol/24 h | 120.8 (70.8) | 162.7 (94.3) | 0.07 |
| Urine citrate, mmol/24 h | 596.6 (353.3) | 499.2 (325.0) | 0.35 |
| Urine creatinine, mg/24 h | 1,273.3 (582.8) | 1,547.9 (712.3) | 0.04* |
| Urine uric acid, mg/24 h | 504.4 (221.5) | 565.3 (250.6) | 0.16 |
| Urine osmolality, mosM | 438.1 (168.8) | 338.7 (296.7) | 0.14 |
| Urine oxalate, mmol/24 h | 0.3 (0.2) | 0.4 (0.2) | 0.09 |
| Urine phosphate, mg/24 h | 798.9 (390.1) | 980.3 (566.4) | 0.12 |
| Urine potassium, mmol/24 h | 59.0 (28.8) | 58.9 (31.4) | 0.90 |
| Urine sodium, mmol/24 h | 131.3 (78.8) | 178.5 (108.1) | 0.05* |
| Urine sulfate, mmol/24 h | 16.5 (7.4) | 19.3 (10.6) | 0.41 |
| Urine pH | 6.1 (0.5) | 6.0 (0.6) | 0.56 |
| Urine volume, mL | 1,991.4 (787.6) | 2,258.5 (858.2) | 0.18 |
| Urine calcium phosphate (supersaturation), dG | −0.5 (1.5) | −0.2 (1.3) | 0.56 |
| Urine uric acid (supersaturation), dG | −0.1 (2.7) | 0.2 (2.9) | 0.78 |
| Urine calcium oxalate (supersaturation), dG | 1.6 (0.8) | 1.9 (0.5) | 0.22 |
| Plaque mean, %papillary surface area | 2.1 (1.4) | 9.5 (4.3) | <0.01* |
Data are presented as means (SD). CSFs, calcium oxalate stone formers; dG, ΔGibbs. Statistical differences between groups were determined by a Kruskal-Wallis test. P < 0.05 was considered statistically significant.
*
Statistical significance.