condition mean min max ZT0-3 17.25 17.25 17.25 ZT4-7 37.4 37.4 37.4 ZT8-11 9.75 9.75 9.75 ZT12-15 14.8 14.8 14.8 ZT16-19 49.0 49.0 49.0 ZT20-23 20.15 20.15 20.15