condition mean min max ZT0-3 14.5 14.5 14.5 ZT4-7 23.3 23.3 23.3 ZT8-11 28.55 28.55 28.55 ZT12-15 14.3 14.3 14.3 ZT16-19 17.85 17.85 17.85 ZT20-23 27.5 27.5 27.5