Table 2.
Patient-time spent at serum potassium levels according to eGFR stratum
| Variable | Serum K+ Level | ||||||
|---|---|---|---|---|---|---|---|
| <3.5 mEq/L | 3.5–3.9 mEq/L | 4.0–4.4 mEq/L | 4.5–4.9 mEq/L | 5.0–5.4 mEq/L | 5.5–5.9 mEq/L | ≥6.0 mEq/L | |
| eGFR<30 ml/min per 1.73 m2 | |||||||
| No. of patient-years (total, 9207) | 126 | 726 | 2211 | 3160 | 2121 | 699 | 164 |
| Patient-time (%) | 1.4 | 7.9 | 24.0 | 34.3 | 23.0 | 7.6 | 1.8 |
| Mean frequency of K+ testing per year | 1.65±1.35 | 1.95±1.96 | 2.27±2.26 | 2.48±2.39 | 2.23±2.17 | 1.69±1.35 | 1.37±0.98 |
| Median frequency of K+ testing per year (p25, p75) | 1 (1, 2) | 1 (1, 2) | 1 (1, 3) | 2 (1, 3) | 1 (1, 3) | 1 (1, 2) | 1 (1, 1) |
| Mean patient-days | 77±117 | 138±173 | 178±203 | 199±214 | 172±201 | 106±138 | 57±99 |
| Median patient-days (p25, p75) | 38 (13, 95) | 80 (31, 170) | 106 (42, 237) | 122 (48, 275) | 99 (38, 225) | 60 (19, 128) | 20 (6, 63) |
| eGFR 30–39 ml/min per 1.73 m2 | |||||||
| No. of patient-years (total 19,230) | 225 | 1681 | 5694 | 6984 | 3636 | 873 | 137 |
| Patient-time (%) | 1.2 | 8.7 | 29.6 | 36.3 | 18.9 | 4.5 | 0.7 |
| Mean frequency of K+ testing per year | 1.46±1.03 | 1.67±1.39 | 2.00±1.78 | 2.06±1.73 | 1.80±1.46 | 1.43±0.91 | 1.23±0.59 |
| Median frequency of K+ testing per year (p25, p75) | 1 (1, 2) | 1 (1, 2) | 1 (1, 2) | 1 (1, 2) | 1 (1, 2) | 1 (1, 2) | 1 (1, 1) |
| Mean patient-days | 97±129 | 172±189 | 226±220 | 235±224 | 190±190 | 116±144 | 62±108 |
| Median patient-days (p25, p75) | 52 (18, 122) | 111 (48, 225) | 153 (71, 313) | 165 (74, 328) | 130 (59, 260) | 70 (21, 158) | 18 (5, 75) |
| eGFR 40–49 ml/min per 1.73 m2 | |||||||
| No. of patient-years (total 37,339) | 486 | 3845 | 12,796 | 13,612 | 5455 | 1018 | 127 |
| Patient-time (%) | 1.3 | 10.3 | 34.3 | 36.5 | 14.6 | 2.7 | 0.3 |
| Mean frequency of K+ testing per year | 1.38±0.91 | 1.60±1.21 | 1.91±1.51 | 1.94±1.51 | 1.61±1.16 | 1.32±0.73 | 1.17±0.49 |
| Median frequency of K+ testing per year (p25, p75) | 1 (1, 1) | 1 (1, 2) | 1 (1, 2) | 1 (1, 2) | 1 (1, 2) | 1 (1, 1) | 1 (1, 1) |
| Mean patient-days | 129±165 | 211±207 | 271±241 | 273±239 | 204±193 | 121±147 | 62±99 |
| Median patient-days (p25, p75) | 70 (27, 170) | 145 (67, 289) | 196 (94, 377) | 201 (97, 377) | 146 (69, 280) | 76 (23, 165) | 19 (5, 84) |
| eGFR 50–59 ml/min per 1.73 m2 | |||||||
| No. of patient-years (total 77,241) | 974 | 9554 | 30,349 | 26,230 | 8701 | 1316 | 117 |
| Patient-time (%) | 1.3 | 12.4 | 39.3 | 34.0 | 11.3 | 1.7 | 0.2 |
| Mean frequency of K+ testing per year | 1.61±1.35 | 1.92±1.63 | 2.42±1.92 | 2.26±1.73 | 1.71±1.26 | 1.34±0.92 | 1.21±0.73 |
| Median frequency of K+ testing per year (p25, p75) | 1 (1, 2) | 1 (1, 2) | 2 (1, 3) | 2 (1, 3) | 1 (1, 2) | 1 (1, 1) | 1 (1, 1) |
| Mean patient-days | 160±182 | 283±254 | 387±297 | 358±277 | 252±217 | 144±158 | 67±107 |
| Median patient-days (p25, p75) | 97 (34, 216) | 205 (93, 393) | 319 (152, 556) | 292 (141, 509) | 191 (92, 355) | 95 (28, 201) | 20 (4, 90) |
Mean values are expressed with SDs. K+, potassium; p25, 25th percentile; p75, 75th percentile.