condition mean min max ZT0-3 22.503549999999997 22.07735 22.92975 ZT4-7 23.429650000000002 23.429650000000002 23.429650000000002 ZT8-11 22.9752 22.9752 22.9752 ZT12-15 0 0 0 ZT16-19 33.5191 33.5191 33.5191 ZT20-23 32.79875 32.79875 32.79875