condition mean min max ZT0-3 0.2472125 0.20621499999999998 0.28821 ZT4-7 0.260792 0.260792 0.260792 ZT8-11 0.13887785 0.13887785 0.13887785 ZT12-15 0 0 0 ZT16-19 0.456554 0.456554 0.456554 ZT20-23 0.8147530000000001 0.8147530000000001 0.8147530000000001