condition mean min max ZT0-3 4.6729275 2.389455 6.9564 ZT4-7 2.217755 2.217755 2.217755 ZT8-11 3.32273 3.32273 3.32273 ZT12-15 0 0 0 ZT16-19 7.685395 7.685395 7.685395 ZT20-23 3.7610599999999996 3.7610599999999996 3.7610599999999996