condition mean min max ZT0-3 1.3518050000000001 1.3518050000000001 1.3518050000000001 ZT4-7 1.8839599999999999 1.8839599999999999 1.8839599999999999 ZT8-11 1.1173000000000002 1.1173000000000002 1.1173000000000002 ZT12-15 0.677255 0.677255 0.677255 ZT16-19 1.19865 1.19865 1.19865 ZT20-23 1.779905 1.779905 1.779905