condition mean min max ZT0-3 6.85 6.85 6.85 ZT4-7 3.0 3.0 3.0 ZT8-11 29.849999999999998 29.849999999999998 29.849999999999998 ZT12-15 4.75 4.75 4.75 ZT16-19 14.049999999999999 14.049999999999999 14.049999999999999 ZT20-23 17.75 17.75 17.75