condition mean min max ZT0-3 26.416555 26.416555 26.416555 ZT4-7 29.219133499999998 29.219133499999998 29.219133499999998 ZT8-11 22.749890999999998 22.749890999999998 22.749890999999998 ZT12-15 30.430784 30.430784 30.430784 ZT16-19 39.86408 39.86408 39.86408 ZT20-23 37.604574 37.604574 37.604574