condition mean min max ZT0-3 6.85761 6.85761 6.85761 ZT4-7 3.7641799999999996 3.7641799999999996 3.7641799999999996 ZT8-11 4.909084999999999 4.909084999999999 4.909084999999999 ZT12-15 16.08745 16.08745 16.08745 ZT16-19 15.610800000000001 15.610800000000001 15.610800000000001 ZT20-23 10.6511 10.6511 10.6511