Table 2.

Cognitive function test results by eGFR categorya

Cognitive TesteGFR (ml/min per 1.73 m2)TotalP
≥60<60
SRTT (ms)229.8 (209.8 to 257.7)237.9 (227.8 to 267.8)230.1 (210.0 to 255.5)0.04
SDST (s)2.66 (2.29 to 3.15)3.45 (2.95 to 4.39)2.67 (2.30 to 3.15)<0.001
SDLT (errors committed)4 (2 to 9)8.5 (2.5 to 14)4 (2 to 9)0.04
  • a Data are median (IQR); P values are calculated by Wilcoxon rank-sum test between the CKD categories and do not take into account the complex sampling design of NHANES III. SDLT, Serial Digit Learning Test; SDST, Symbol Digit Substitution Test; SRTT, Simple Reaction Time Test.