condition mean min max ZT0-3 12.8278125 4.510425 21.1452 ZT4-7 1.81658 1.81658 1.81658 ZT8-11 4.625675 4.625675 4.625675 ZT12-15 0 0 0 ZT16-19 5.5186150000000005 5.5186150000000005 5.5186150000000005 ZT20-23 1.9432049999999998 1.9432049999999998 1.9432049999999998