condition mean min max ZT0-3 23.274683333333332 12.84975 32.7925 ZT4-7 1.7834699999999999 1.7834699999999999 1.7834699999999999 ZT8-11 0.22654790000000002 0.22654790000000002 0.22654790000000002 ZT12-15 0.70100075 0.5660925 0.835909 ZT16-19 0.686374 0.686374 0.686374 ZT20-23 6.787155 6.787155 6.787155