condition mean min max ZT0-3 21.85 21.85 21.85 ZT4-7 14.0 14.0 14.0 ZT8-11 23.75 23.75 23.75 ZT12-15 13.3 13.3 13.3 ZT16-19 34.3 34.3 34.3 ZT20-23 25.25 25.25 25.25