condition mean min max ZT0-3 50.391850000000005 44.3053 56.4784 ZT4-7 71.87049999999999 71.87049999999999 71.87049999999999 ZT8-11 55.4696 55.4696 55.4696 ZT12-15 0 0 0 ZT16-19 91.66120000000001 91.66120000000001 91.66120000000001 ZT20-23 76.0721 76.0721 76.0721