condition mean min max ZT0-3 4.180781666666666 2.64862 5.43515 ZT4-7 1.1755900000000001 1.1755900000000001 1.1755900000000001 ZT8-11 0.971211 0.971211 0.971211 ZT12-15 1.7588225000000002 1.12921 2.3884350000000003 ZT16-19 2.541755 2.541755 2.541755 ZT20-23 5.568804999999999 5.568804999999999 5.568804999999999