condition mean min max ZT0-3 25.092539 25.092539 25.092539 ZT4-7 20.228153499999998 20.228153499999998 20.228153499999998 ZT8-11 18.440351 18.440351 18.440351 ZT12-15 19.9944485 19.9944485 19.9944485 ZT16-19 18.1768675 18.1768675 18.1768675 ZT20-23 18.431952000000003 18.431952000000003 18.431952000000003