condition mean min max ZT0-3 14.65 14.65 14.65 ZT4-7 14.5 14.5 14.5 ZT8-11 3.9000000000000004 3.9000000000000004 3.9000000000000004 ZT12-15 17.35 17.35 17.35 ZT16-19 21.849999999999998 21.849999999999998 21.849999999999998 ZT20-23 36.3 36.3 36.3