condition mean min max ZT0-3 33.65815 33.65815 33.65815 ZT4-7 31.13895 31.13895 31.13895 ZT8-11 24.209600000000002 24.209600000000002 24.209600000000002 ZT12-15 30.893700000000003 30.893700000000003 30.893700000000003 ZT16-19 31.11365 31.11365 31.11365 ZT20-23 32.98325 32.98325 32.98325