condition mean min max ZT0-3 20.548458235 20.510192149999998 20.586724320000002 ZT4-7 21.632477055 18.546597679999998 24.71835643 ZT8-11 24.65223785166667 24.642023403333333 24.6624523 ZT12-15 18.305739673333335 16.29870335 20.312775996666666 ZT16-19 17.341348165 16.9505322 17.73216413 ZT20-23 13.3556038445 12.207322137 14.503885552