condition mean min max ZT0-3 9.3245325 7.6791350000000005 10.96993 ZT4-7 21.40665 21.40665 21.40665 ZT8-11 19.56025 19.56025 19.56025 ZT12-15 0 0 0 ZT16-19 15.5898 15.5898 15.5898 ZT20-23 14.2053 14.2053 14.2053