Table 1. Baseline characteristics of the dialysis patients with or without parathyroidectomy (PTx) at the time of undergoing radionuclide parathyroid scanning, before and after being matched on propensity score.
| Before matching |
After matching |
|||||
|---|---|---|---|---|---|---|
| Overall (n = 2786) | PTx (n = 1707) | Control (n = 1079) | PTx (n = 998) | Control (n = 998) | Standardized difference§ | |
| Age (years) | 54.0 ± 12.5 | 52.9 ± 11.9 | 55.8 ± 13.4 | 54.7 ± 11.8 | 55.0 ± 13.1 | 0.02 |
| Male sex (%) | 1131(40.6) | 676 (39.6) | 455 (42.2) | 428 (42.9) | 424 (42.5) | 0.01 |
| HD (%) | 2548 (91.5) | 1577 (92.4) | 971 (90.0) | 902 (90.4) | 903 (90.5) | <0.01 |
| Dialysis duration (years) | 4.61 ± 2.98 | 4.90 ± 2.93 | 4.14 ± 3.00 | 4.24 ± 2.78 | 4.31 ± 2.99 | 0.02 |
| DM (%) | 604 (21.7) | 346 (20.3) | 258 (23.9) | 244 (24.5) | 219 (21.9) | 0.06 |
| Hypertension (%) | 1434 (51.5) | 859 (50.3) | 575 (53.3) | 539 (54.0) | 518 (51.9) | 0.04 |
| Hyperlipidemia (%) | 680 (24.4) | 439 (25.7) | 241 (22.3) | 279 (28.0) | 213 (21.3) | 0.15 |
| AMI (%) | 71 (2.6) | 32 (1.9) | 39 (3.6) | 24 (2.4) | 29 (2.9) | 0.03 |
| CAD (%) | 396 (14.2) | 234 (13.7) | 162 (15.0) | 173 (17.3) | 137 (13.7) | 0.10 |
| CHF (%) | 448 (16.1) | 244 (14.3) | 204 (18.9) | 179 (17.9) | 181 (18.1) | 0.01 |
| Arrhythmia (%) | 327 (11.7) | 184 (10.8) | 143 (13.3) | 134 (13.4) | 124 (12.4) | 0.03 |
| PVD (%) | 399 (14.3) | 258 (15.1) | 141 (13.1) | 167 (16.7) | 125 (12.5) | 0.12 |
| CVA (%) | 308 (11.1) | 177 (10.4) | 131 (12.1) | 134 (13.4) | 118 (11.8) | 0.05 |
| Anemia¶ (%) | 463 (16.6) | 233 (13.7) | 230 (21.3) | 179 (17.9) | 184 (18.4) | 0.01 |
| COPD (%) | 282 (10.1) | 154 (9.0) | 128 (11.9) | 97 (9.7) | 116 (11.6) | 0.06 |
| GI bleeding (%) | 725 (26.0) | 476 (27.9) | 249 (23.1) | 302 (30.3) | 232 (23.3) | 0.16 |
| Liver disease (%) | 558 (20.0) | 339 (19.9) | 219 (20.3) | 212 (21.2) | 189 (18.9) | 0.06 |
| Dementia (%) | 33 (1.2) | 14 (0.8) | 19 (1.8) | 13 (1.3) | 14 (1.4) | 0.01 |
Abbreviations: HD, hemodialysis; DM, diabetes mellitus; AMI, acute myocardial infarction; CAD, coronary artery disease; CHF, congestive heart failure; PVD, peripheral vascular disease; CVA, cerebral vascular accident, COPD, chronic obstructive pulmonary disease; GI bleeding, gastrointestinal bleeding; PTx, parathyroidectomy.
§Standardized difference = difference in proportions or means divided by a pooled estimate of standard deviation.
¶May only indicate resistance of erythropoiesis-stimulating agents and/or requirement of blood transfusion (supplementary information).