condition mean min max ZT0-3 0.7781791666666666 0.563188 0.9131075 ZT4-7 0.43234799999999995 0.43234799999999995 0.43234799999999995 ZT8-11 0.6931745 0.6931745 0.6931745 ZT12-15 1.48792 1.4419849999999999 1.533855 ZT16-19 1.16256 1.16256 1.16256 ZT20-23 1.259008 1.259008 1.259008