condition mean min max ZT0-3 22.05 22.05 22.05 ZT4-7 17.4 17.4 17.4 ZT8-11 26.25 26.25 26.25 ZT12-15 13.0 13.0 13.0 ZT16-19 15.3 15.3 15.3 ZT20-23 14.049999999999999 14.049999999999999 14.049999999999999