condition mean min max ZT0-3 1.798375 1.798375 1.798375 ZT4-7 1.4112864999999999 1.4112864999999999 1.4112864999999999 ZT8-11 1.256285 1.256285 1.256285 ZT12-15 1.0936685 1.0936685 1.0936685 ZT16-19 2.2885400000000002 2.2885400000000002 2.2885400000000002 ZT20-23 2.69827 2.69827 2.69827