condition mean min max ZT0-3 12.1900308785 11.018476546999999 13.36158521 ZT4-7 10.053042554249998 9.778478568499999 10.32760654 ZT8-11 16.97162169 13.6347437 20.30849968 ZT12-15 29.512255752499996 27.747035385 31.277476119999996 ZT16-19 26.748952307499998 24.900201095 28.59770352 ZT20-23 20.1267606125 18.938225265 21.31529596