condition mean min max ZT0-3 60.13645 60.13645 60.13645 ZT4-7 40.954899999999995 40.954899999999995 40.954899999999995 ZT8-11 65.05449999999999 65.05449999999999 65.05449999999999 ZT12-15 127.181 127.181 127.181 ZT16-19 177.90949999999998 177.90949999999998 177.90949999999998 ZT20-23 119.461 119.461 119.461