Table 2.

Time to progression to more advanced CKD stage among participants in the Chronic Renal Insufficiency Cohort study, according to initial CKD stage

Stage of CKDaMedian Time [IQR] or N
Stage 3a
 Entered CKD stage 3a1437
 Transitioned to stage 3b624
 Median time spent in each stage, yr7.9 [2.3 to >12b]
Stage 3b
 Entered CKD stage 3b2160
 Transitioned to stage 41095
 Median time spent in each stage, yr5.0 [1.8–11.5]
Stage 4
 Entered CKD stage 41703
 Transitioned to stage 5742
 Median time spent in each stage, yr4.2 [2.4–6.6]
Stage 5
 Entered CKD stage 5741
 Transitioned to ESKD655
 Median time spent in each stage, yr0.8 [0.3–1.6]
  • IQR, interquartile range.

  • a Stage 2: eGFR= 60 to <90 ml/min per 1.73 m2; stage 3a: eGFR= 45 to <60 ml/min per 1.73 m2; stage 3b: eGFR= 30 to <45 ml/min per 1.73 m2; stage 4: eGFR= 15 to <30 ml/min per 1.73 m2; stage 5: eGFR<15 ml/min per 1.73 m2.

  • b Follow-up time censored at 12 yr.