condition mean min max ZT0-3 6.1786075 5.0777 7.279515 ZT4-7 1.8060100000000001 1.8060100000000001 1.8060100000000001 ZT8-11 1.436665 1.436665 1.436665 ZT12-15 0 0 0 ZT16-19 1.854935 1.854935 1.854935 ZT20-23 3.1083800000000004 3.1083800000000004 3.1083800000000004