condition mean min max ZT0-3 1.7621850000000001 1.7326650000000001 1.7917049999999999 ZT4-7 1.401975 1.401975 1.401975 ZT8-11 0.5533595 0.5533595 0.5533595 ZT12-15 0 0 0 ZT16-19 1.7216900000000002 1.7216900000000002 1.7216900000000002 ZT20-23 2.143615 2.143615 2.143615