condition mean min max ZT0-3 2.82597 2.82597 2.82597 ZT4-7 4.12122 4.12122 4.12122 ZT8-11 1.1419985000000001 1.1419985000000001 1.1419985000000001 ZT12-15 0.172119 0.172119 0.172119 ZT16-19 0.30027899999999996 0.30027899999999996 0.30027899999999996 ZT20-23 0.7834343333333333 0.7834343333333333 0.7834343333333333