Table 2.

Patient-time spent at serum potassium levels according to eGFR stratum

VariableSerum K+ Level
<3.5 mEq/L3.5–3.9 mEq/L4.0–4.4 mEq/L4.5–4.9 mEq/L5.0–5.4 mEq/L5.5–5.9 mEq/L≥6.0 mEq/L
eGFR<30 ml/min per 1.73 m2
 No. of patient-years (total, 9207)126726221131602121699164
 Patient-time (%)1.47.924.034.323.07.61.8
 Mean frequency of K+ testing per year 1.65±1.351.95±1.962.27±2.262.48±2.392.23±2.171.69±1.351.37±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-days77±117138±173178±203199±214172±201106±13857±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)2251681569469843636873137
 Patient-time (%)1.28.729.636.318.94.50.7
 Mean frequency of K+ testing per year 1.46±1.031.67±1.392.00±1.782.06±1.731.80±1.461.43±0.911.23±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-days97±129172±189226±220235±224190±190116±14462±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)486384512,79613,61254551018127
 Patient-time (%)1.310.334.336.514.62.70.3
 Mean frequency of K+ testing per year 1.38±0.911.60±1.211.91±1.511.94±1.511.61±1.161.32±0.731.17±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-days129±165211±207271±241273±239204±193121±14762±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)974955430,34926,23087011316117
 Patient-time (%)1.312.439.334.011.31.70.2
 Mean frequency of K+ testing per year 1.61±1.351.92±1.632.42±1.922.26±1.731.71±1.261.34±0.921.21±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-days160±182283±254387±297358±277252±217144±15867±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.