condition mean min max ZT0-3 9.2 9.2 9.2 ZT4-7 9.7 9.7 9.7 ZT8-11 32.25 32.25 32.25 ZT12-15 26.5 26.5 26.5 ZT16-19 23.5 23.5 23.5 ZT20-23 12.049999999999999 12.049999999999999 12.049999999999999