condition mean min max ZT0-3 1.5453400000000002 1.4579650000000002 1.6327150000000001 ZT4-7 2.595885 2.595885 2.595885 ZT8-11 1.429045 1.429045 1.429045 ZT12-15 0 0 0 ZT16-19 1.530945 1.530945 1.530945 ZT20-23 2.06048 2.06048 2.06048