condition mean min max ZT0-3 1.10342275 0.9824044999999999 1.2244410000000001 ZT4-7 1.8819400000000002 1.8819400000000002 1.8819400000000002 ZT8-11 2.1027545 2.1027545 2.1027545 ZT12-15 0 0 0 ZT16-19 1.20378 1.20378 1.20378 ZT20-23 0.878808 0.878808 0.878808