2) In the hypertension groups (JNC VII), blood pressure had negative correlation with predicted GFR of Cockcroft Gault such as in the pre-hypertension group: systolic and GFR (r=-0.19; p<0.05 perspectively), dyastolic and GFR (r=-0.15; p<0.01); hypertension type I: systolic and GFR (r=-0.41; p<0.01 perspectively), dyastolic and GFR (r=-0.27; p<0.01); hypertension type II: systolic and GFR (r=-0.79; p<0.01 perspectively), dyastolic and GFR (r=-0.45; p<0.01).