condition mean min max ZT0-3 14.273499999999999 14.273499999999999 14.273499999999999 ZT4-7 12.618749999999999 12.618749999999999 12.618749999999999 ZT8-11 14.06455 14.06455 14.06455 ZT12-15 13.16845 13.16845 13.16845 ZT16-19 17.52615 17.52615 17.52615 ZT20-23 15.8725 15.8725 15.8725