condition mean min max ZT0-3 34.231403 34.231403 34.231403 ZT4-7 19.561459499999998 19.561459499999998 19.561459499999998 ZT8-11 14.6658455 14.6658455 14.6658455 ZT12-15 16.8660375 16.8660375 16.8660375 ZT16-19 16.693969000000003 16.693969000000003 16.693969000000003 ZT20-23 20.0398945 20.0398945 20.0398945