condition mean min max ZT0-3 3.1908 3.14953 3.2320699999999998 ZT4-7 2.5036199999999997 2.5036199999999997 2.5036199999999997 ZT8-11 2.834665 2.834665 2.834665 ZT12-15 0 0 0 ZT16-19 3.098575 3.098575 3.098575 ZT20-23 3.4333400000000003 3.4333400000000003 3.4333400000000003