condition mean min max ZT0-3 36.6459 36.6459 36.6459 ZT4-7 30.32795 30.32795 30.32795 ZT8-11 23.4738 23.4738 23.4738 ZT12-15 26.503549999999997 26.503549999999997 26.503549999999997 ZT16-19 35.946349999999995 35.946349999999995 35.946349999999995 ZT20-23 35.95565 35.95565 35.95565