Table 2.
Characteristics of the patients in the matched subgroups.
| Characteristic | Group 1 (n = 355) | SHPT group (n = 355) | P value | Group2 (n = 245) | SHPT group (n = 245) | P value | Group 3 (n = 202) | SHPT group (n = 202) | P value |
|---|---|---|---|---|---|---|---|---|---|
| Median age (IQR)–year | 57.3 (49.8–65.2) | 57.7 (50.0–65.3) | 0.559 | 58.2 (51.4–66.2) | 58.7 (51.3–66.4) | 0.201 | 56.5 (48.2–64.1) | 57.0 (47.8–64.2) | 0.141 |
| Male sex – no. (%) | 178 (50.1) | 178 (50.1) | NA | 116 (47.3) | 116 (47.3) | NA | 100 (49.5) | 100 (49.5) | NA |
| Median dialysis vintage (IQR) –month | 32.7 (7.6–62.9) | 35.2 (12.2–65.2) | <0.001 | 33.7 (7.9–68.4) | 37.5 (12.0–68.7) | 0.010 | 60.7 (19.7–97.3) | 60.3 (21.6–100.2) | 0.521 |
| Diabetes – no. (%) | 112 (31.5) | 112 (31.5) | NA | 65 (26.5) | 65 (26.5) | NA | 52 (25.7) | 52 (25.7) | NA |
| iPTH (pg/mL) | <0.001 | <0.001 | <0.001 | ||||||
| Mean ± SD | 80.6 ± 11.3 | 977.9 ± 458.8 | 45.1 ± 8.7 | 965.7 ± 437.1 | 15.8 ± 8.4 | 782.4 ± 278.3 | |||
| Median | 80.7 | 812.5 | 45.1 | 783.7 | 16.3 | 691.8 | |||
| (IQR) | (72.1–90.0) | (683.3–1061.0) | (38.4–52.8) | (680.7–1061.3) | (8.7–22.9) | (633.5–799.8) | |||
| Calcium (mmol/L)* | 2.25 ± 0.21 | 2.28 ± 0.21 | >0.900 | 2.28 ± 0.20 | 2.29 ± 0.23 | 0.737 | 2.26 ± 0.27 | 2.3 ± 0.23 | 0.142 |
| Phosphate (mmol/L)* | 1.64 ± 0.41 | 2.01 ± 0.41 | <0.001 | 1.63 ± 0.40 | 1.97 ± 0.40 | <0.001 | 1.62 ± 0.36 | 1.95 ± 0.39 | <0.001 |
| Albumin (g/dL)* | 3.95 ± 0.30 | 3.83 ± 0.26 | <0.001 | 3.90 ± 0.28 | 3.82 ± 0.26 | 0.010 | 3.93 ± 0.32 | 3.98 ± 0.24 | 0.339 |
| Hemoglobin (g/dL)* | 11.3 ± 0.8 | 11.2 ± 0.9 | 0.124 | 11.2 ± 0.8 | 11.2 ± 0.9 | 0.421 | 11.4 ± 0.9 | 11.4 ± 1.0 | 0.925 |
*Means ± SD.
Group 1, Low PTH Group 1 (60–100 pg/mL); Group 2, Low PTH Group 2 (30–60 pg/mL); Group 3, Low PTH Group 3 (<30 pg/mL).
iPTH, intact parathyroid hormone; IQR, interquartile range; NA, not applicable; SD, standard deviation; SHPT, secondary hyperparathyroidism.