condition mean min max ZT0-3 74.744925 71.8961 77.59375 ZT4-7 86.02965 86.02965 86.02965 ZT8-11 100.94409999999999 100.94409999999999 100.94409999999999 ZT12-15 0 0 0 ZT16-19 108.65615 108.65615 108.65615 ZT20-23 81.0698 81.0698 81.0698