condition mean min max ZT0-3 21.55 21.55 21.55 ZT4-7 25.3 25.3 25.3 ZT8-11 21.15 21.15 21.15 ZT12-15 17.2 17.2 17.2 ZT16-19 3.55 3.55 3.55 ZT20-23 22.5 22.5 22.5