condition mean min max ZT0-3 25.75 25.75 25.75 ZT4-7 43.5 43.5 43.5 ZT8-11 30.5 30.5 30.5 ZT12-15 46.75 46.75 46.75 ZT16-19 21.0 21.0 21.0 ZT20-23 39.25 39.25 39.25