Table 1.
Baseline characteristics of study subjects
| Variables | Daily Trial |
Nocturnal Trial |
||||||
|---|---|---|---|---|---|---|---|---|
| N | All (N = 245) | 3 times (N = 120) | 6 times (N = 125) | N | All (N = 87) | 3 times (N = 42) | 6 times (N = 45) | |
| Age (years) | 245 | 50.4 ± 13.9 | 52.0 ± 14.1 | 48.9 ± 13.6 | 87 | 52.8 ± 13.6 | 54.0 ± 12.9 | 51.7 ± 14.4 |
| Male | 245 | 151 (61.6) | 73 (60.8) | 78 (62.4) | 87 | 57 (65.5) | 28 (66.7) | 29 (64.4) |
| Race/ethnicity | 245 | 87 | ||||||
| Black/African American/African | 102 (41.6) | 53 (44.2) | 49 (39.2) | 23 (26.4) | 11 (26.2) | 12 (26.7) | ||
| White/Caucasian, non-Hispanic | 89 (36.3) | 46 (38.3) | 43 (34.4) | 48 (55.2) | 21 (50.0) | 27 (60.0) | ||
| Other/mixed | 54 (22.1) | 21 (17.5) | 33 (27.4) | 16 (18.3) | 10 (23.8) | 6 (13.3) | ||
| Primary language English | 245 | 196 (80.0) | 101 (84.2) | 95 (76) | 87 | 77 (88.5) | 36 (85.7) | 41 (91.1) |
| ESRD vintage (years) | 245 | 3.64 (0.63, 14.26) | 3.40 (0.58, 12.94) | 3.85 (0.69, 17.31) | 87 | 0.91 (0.09, 11.48) | 0.53 (0.10, 6.00) | 1.32 (0.09, 12.55) |
| Education | 242 | 86 | ||||||
| <High school graduate | 51 (21.1) | 21 (17.6) | 30 (24.4) | 13 (15.1) | 5 (11.9) | 8 (18.2) | ||
| High school graduate | 58 (24.0) | 32 (26.9) | 26 (21.1) | 21 (24.4) | 9 (21.4) | 12 (27.3) | ||
| Post high school | 133 (55.0) | 66 (55.5) | 67 (54.5) | 52 (60.5) | 28 (66.7) | 24 (54.5) | ||
| Diabetes | 245 | 100 (40.8) | 50 (41.7) | 50 (40.0) | 87 | 37 (42.5) | 18 (42.9) | 19 (42.2) |
| Current or former smoking | 245 | 91 (37.1) | 45 (37.5) | 46 (36.8) | 87 | 43 (49.4) | 25 (59.5) | 18 (40.0) |
| Stroke | 245 | 18 (7.3) | 9 (7.5) | 9 (7.2) | 87 | 2 (2.3) | 1 (2.4) | 1 (2.2) |
| Myocardial infarction | 245 | 27 (11.0) | 16 (13.3) | 11 (8.8) | 87 | 9 (10.3) | 4 (9.5) | 5 (11.1) |
| Charlson comorbidity index | 245 | 1.82 ± 1.95 | 1.88 ± 2.03 | 1.76 ± 1.89 | 87 | 1.72 ± 1.75 | 1.88 ± 1.93 | 1.58 ± 1.57 |
| Beck Depression Inventory | 240 | 10 (3, 24) | 10 (3, 24) | 11 (3, 26) | 87 | 10 (3, 26) | 10 (4, 26) | 10 (3, 19) |
| Benzodiazepines | 245 | 31 (12.6) | 13 (10.8) | 18 (14.4) | 87 | 15 (17.2) | 7 (16.7) | 8 (17.8) |
| Antidepressants | 245 | 35 (14.3) | 15 (12.5) | 20 (16.0) | 87 | 22 (25.3) | 10 (23.8) | 12 (26.7) |
| Opioids | 245 | 42 (17.1) | 19 (15.8) | 23 (18.4) | 87 | 18 (20.7) | 7 (16.7) | 11 (24.4) |
| Predialysis SBP (mmHg) | 245 | 146 ± 18 | 146 ± 18 | 147 ± 18 | 87 | 149 ± 18 | 153 ± 22 | 145 ± 13 |
| Predialysis DBP (mmHg) | 245 | 80 ± 12 | 78 ± 12 | 81 ± 11 | 87 | 81 ± 12 | 83 ± 13 | 80 ± 11 |
| Weekly standard Kt/V | 245 | 2.52 ± 0.35 | 2.53 ± 0.39 | 2.50 ± 0.31 | 84 | 2.34 ± 0.31 | 2.34 ± 0.34 | 2.35 ± 0.28 |
| Hemoglobin (g/dL) | 244 | 11.9 ± 1.3 | 12.0 ± 1.2 | 11.9 ± 1.3 | 87 | 11.8 ± 1.1 | 11.9 ± 1.1 | 11.6 ± 1.1 |
| Phosphate (mg/dL) | 245 | 5.78 ± 1.64 | 5.64 ± 1.53 | 5.91 ± 1.73 | 87 | 5.80 ± 1.61 | 5.77 ± 1.65 | 5.82 ± 1.59 |
| Albumin (g/dL) | 245 | 3.94 ± 0.42 | 3.94 ± 0.46 | 3.94 ± 0.37 | 87 | 3.91 ± 0.49 | 3.92 ± 0.51 | 3.90 ± 0.48 |
Results are shown as mean ± standard deviation, median (10th, 90th percentiles range), or frequency (%), as appropriate. DBP, diastolic blood pressure; SBP, systolic blood pressure.