Table 4.

Percentiles of β-trace protein and β2-microglobulin distribution in persons aged 20–39 years without hypertension or diabetes mellitus overall, by sex, and by race/ethnicity, US population (1988–1994)

Weighted Percentilesn
1st5th25th50th75th95th99th
β-trace protein (mg/L)
 Overall0.250.340.450.520.580.690.811513
  Male0.220.340.470.540.600.720.80688
  Female0.250.340.440.500.550.660.96825
 Non-Hispanic white0.300.380.470.530.590.700.91437
  MaleNA0.380.480.560.610.72NA182
  FemaleNA0.370.470.510.570.67NA255
 Non-Hispanic black0.220.310.420.470.520.640.76502
  MaleNA0.310.420.490.560.66NA269
 Mexican American0.210.300.420.480.560.670.76509
  MaleNA0.290.430.500.580.69NA243
  FemaleNA0.310.400.470.540.64NA266
β2-microglobulin (mg/L)
 Overall1.031.221.431.591.802.272.801514
  Male1.081.271.481.661.862.342.70689
  Female1.031.191.401.541.742.272.92825
 Non-Hispanic white1.041.261.461.621.812.272.82438
  MaleNA1.311.491.681.862.21NA183
  FemaleNA1.231.431.581.742.29NA255
 Non-Hispanic black1.031.131.351.511.752.212.84502
  MaleNA1.191.371.541.792.42NA233
  FemaleNA1.081.331.501.712.13NA269
 Mexican American1.031.141.371.541.82.342.97509
  MaleNA1.171.421.601.822.32NA243
  FemaleNA1.131.341.491.782.58NA266
  • There were insufficient numbers to generate sex- and race-specific estimates for the 1st and 99th percentiles. See text for comparison of mean serum concentrations. Sample size shows the number of participants used as the basis for the nationally representative estimates. NA, not available.