condition mean min max ZT0-3 0.83879470775 0.46093768 1.2166517355 ZT4-7 1.97181875225 1.9367743419999999 2.0068631625 ZT8-11 1.8644707495 1.660677883 2.068263616 ZT12-15 2.0373126399999997 1.852533024 2.222092256 ZT16-19 3.1557174285 2.506368166 3.805066691 ZT20-23 5.20756544875 5.1814089555 5.233721942