condition mean min max ZT0-3 15.564913333333333 12.00314 18.7072 ZT4-7 17.006 17.006 17.006 ZT8-11 41.1757 41.1757 41.1757 ZT12-15 29.512075 25.990949999999998 33.0332 ZT16-19 21.148049999999998 21.148049999999998 21.148049999999998 ZT20-23 11.31475 11.31475 11.31475