condition mean min max ZT0-3 1.5883699999999998 1.5883699999999998 1.5883699999999998 ZT4-7 2.352565 2.352565 2.352565 ZT8-11 1.910275 1.910275 1.910275 ZT12-15 1.884075 1.884075 1.884075 ZT16-19 1.469205 1.469205 1.469205 ZT20-23 2.6123149999999997 2.6123149999999997 2.6123149999999997