condition mean min max ZT0-3 0.39884850000000005 0.30428750000000004 0.47587 ZT4-7 0.3732475 0.3732475 0.3732475 ZT8-11 0.6501635 0.6501635 0.6501635 ZT12-15 0.70143225 0.5514254999999999 0.8514390000000001 ZT16-19 1.059768 1.059768 1.059768 ZT20-23 0.7859745 0.7859745 0.7859745