Table 1.
| Variable | Urine volume |
P value | |
|---|---|---|---|
| <2.5 L on the initial collection (n=826) | ≥2.5 L on the initial collection (n=274) | ||
| Sex (n=1100) | .013c | ||
| Female (n=448) | 354/826 (42.9) | 94/274 (34.3) | |
| Male (n=652) | 472/826 (57.1) | 180/274 (65.7) | |
| Age (y) | 58.2±15.1 | 56.7±13.3 | .016c |
| BMI (kg/m2) | 27.7±6.3 | 28.7±6.8 | .025c |
| Urine dietary factors (n=1100) | |||
| Urine sodium level (mmol/dL) | 151±68.5 | 203.7±90.3 | <.0001c |
| Urine phosphorus level (g/d) | 0.9±0.3 | 1.0±0.3 | <.0001c |
| Urine calcium level (mg/d) | 196.0±110.4 | 256.0±135.5 | <.0001c |
| SSCaOx | 7.6±3.5 | 4.6±2.4 | <.0001c |
| UUN level (g/d) | 10.0±4.0 | 12.7±4.2 | <.0001c |
| PCR (g/kg per day) | 1.0±0.3 | 1.1±0.3 | <.0001c |
| Comorbidities requiring fluid restriction (n=1046) | |||
| Heart failure | 26/782 (3.3) | 7/264 (2.7) | .59 |
| Hyponatremia | 32/782 (4.1) | 17/264 (6.4) | .12 |
| Cirrhosis | 13/782 (1.7) | 3/264 (1.1) | .55 |
| Medications at presentation (n=1043) | |||
| Hydrochlorothiazide | 28/781 (3.6) | 7/262 (2.7) | .48 |
| Chlorthalidone | 235/781 (30.1) | 85/262 (32.5) | .47 |
| Indapamide | 8/781 (1.0) | 3/262 (1.1) | .87 |
| Amiloride | 9/781 (1.2) | 4/262 (1.5) | .64 |
| Furosemide | 26/781 (3.3) | 4/262 (1.5) | .13 |
| Bumetanide | 0/781 (0) | 1/262 (0.4) | .084 |
| Torsemide | 1/781 (0.1) | 2/262 (0.8) | .097 |
| Potassium citrate | 113/781 (14.5) | 33/262 (12.6) | .45 |
| Sodium bicarbonate | 3/781 (0.4) | 1/262 (0.4) | >.99 |
| Collection day | .36 | ||
| Sunday | 227/826 (27.5) | 77/274 (28.1) | |
| Monday | 165/826 (20.0) | 60/274 (21.9) | |
| Tuesday | 141/826 (17.1) | 38/274 (13.9) | |
| Wednesday | 112/826 (13.6) | 48/274 (17.5) | |
| Thursday | 103/826 (12.5) | 34/274 (12.4) | |
| Friday | 50/826 (6.1) | 12/274 (4.4) | |
| Saturday | 28/826 (3.4) | 5/274 (1.8) | |
| Weekday vs weekend | .77 | ||
| Weekday | 571/826 (69.1) | 192/274 (70.1) | |
| Weekend | 255/826 (30.9) | 82/274 (29.9) | |
a
BMI = body mass index; PCR = protein catabolic rate; SSCaOx = supersaturation of calcium oxalate; UUN = urine urea nitrogen.
b
Data are presented as mean ± SD or as number/total number (percentage).
c
Any P value less than .05.