condition mean min max ZT0-3 9.532380136 9.503215716 9.561544556 ZT4-7 8.604790024 8.483854920666667 8.725725127333334 ZT8-11 7.093378412333333 6.962324212 7.224432612666667 ZT12-15 7.148413742000001 5.983344647 8.313482837 ZT16-19 7.610274090166667 6.794673805666667 8.425874374666666 ZT20-23 9.1158123055 7.632685108 10.598939503