condition mean min max ZT0-3 9.5 9.5 9.5 ZT4-7 15.2 15.2 15.2 ZT8-11 27.35 27.35 27.35 ZT12-15 14.35 14.35 14.35 ZT16-19 14.149999999999999 14.149999999999999 14.149999999999999 ZT20-23 28.95 28.95 28.95