condition mean min max ZT0-3 0.68170475 0.6302515 0.733158 ZT4-7 0.7976475000000001 0.7976475000000001 0.7976475000000001 ZT8-11 0.717696 0.717696 0.717696 ZT12-15 0 0 0 ZT16-19 0.788924 0.788924 0.788924 ZT20-23 0.4822685 0.4822685 0.4822685