condition mean min max ZT0-3 4.414937500000001 4.20992 4.619955 ZT4-7 3.8325500000000003 3.8325500000000003 3.8325500000000003 ZT8-11 2.34535 2.34535 2.34535 ZT12-15 0 0 0 ZT16-19 3.218845 3.218845 3.218845 ZT20-23 4.079549999999999 4.079549999999999 4.079549999999999