Figure 1.
Intercept and slope parameters estimated from linear regression models are shown for each time period (solid round symbols) with corresponding 99.99% confidence regions (indicated by the surrounding ellipses) A point representing the hypothetical regression parameters (β0=0 and β1=1) that one would expect if the two measures agreed is presented for comparison (solid square symbol). None of the 99.99% confidence regions contain this hypothetical point, providing evidence that D-LDL-C and C-LDL-C measures do not agree and that the extent of lack of agreement differs by time periods.