condition mean min max ZT0-3 5.209573945 2.326752738 8.092395152 ZT4-7 3.1923002594999996 2.519375287 3.865225232 ZT8-11 4.529702846499999 3.7776573669999998 5.281748326 ZT12-15 5.97338415525 5.3637103285 6.583057982 ZT16-19 6.9309090074999995 5.661446229499999 8.2003717855 ZT20-23 11.953743791 9.780282427 14.127205155