condition mean min max ZT0-3 25.20279602 23.53613516 26.86945688 ZT4-7 15.464248640000001 14.06517201 16.86332527 ZT8-11 21.40301597 17.387173325 25.418858614999998 ZT12-15 18.7406344425 17.216155314999998 20.26511357 ZT16-19 12.7689745925 11.605435255 13.932513929999999 ZT20-23 22.5180030425 18.977754295 26.05825179