condition mean min max ZT0-3 27.8 27.8 27.8 ZT4-7 17.0 17.0 17.0 ZT8-11 42.65 42.65 42.65 ZT12-15 15.5 15.5 15.5 ZT16-19 38.5 38.5 38.5 ZT20-23 25.25 25.25 25.25