- Has had oral glucose tolerance test including determination of plasma glucose and insulin levels at baseline and 30 and 120 minutes within the past 3 months, meeting the following criteria: 1. Normal fasting blood glucose (<7.0 mmol/l), 2. Normal glucose tolerance at 120 minutes (<11.1 mmol/l), 3. Meets criteria for either normal insulin sensitivity or insulin resistance, based upon the Matsuda insulin sensitivity index