condition mean min max ZT0-3 83.146275 73.91345 92.3791 ZT4-7 41.60680000000001 41.60680000000001 41.60680000000001 ZT8-11 46.9648 46.9648 46.9648 ZT12-15 0 0 0 ZT16-19 71.4769 71.4769 71.4769 ZT20-23 104.082 104.082 104.082