condition mean min max ZT0-3 0.780885 0.780885 0.780885 ZT4-7 0.26544049999999997 0.26544049999999997 0.26544049999999997 ZT8-11 0.180235 0.180235 0.180235 ZT12-15 1.60086 1.60086 1.60086 ZT16-19 1.682545 1.682545 1.682545 ZT20-23 2.072265 2.072265 2.072265