condition mean min max ZT0-3 2.53366580325 2.004028811 3.0633027954999994 ZT4-7 2.11782872125 1.9839103405 2.251747102 ZT8-11 2.3207860005 1.6865905045 2.9549814965000003 ZT12-15 1.67776547975 1.2598952584999998 2.095635701 ZT16-19 0.987418821 0.921512873 1.053324769 ZT20-23 1.03412169875 1.022185752 1.0460576455