condition mean min max ZT0-3 26.6617586825 25.865459755 27.45805761 ZT4-7 22.408444697500002 21.46302375 23.353865645 ZT8-11 23.704092105 21.67464315 25.73354106 ZT12-15 19.425671015 17.74501323 21.1063288 ZT16-19 25.665699945 24.674372079999998 26.657027810000002 ZT20-23 30.13287891 27.88138514 32.38437268