condition mean min max ZT0-3 40.5 40.5 40.5 ZT4-7 22.1 22.1 22.1 ZT8-11 19.35 19.35 19.35 ZT12-15 14.45 14.45 14.45 ZT16-19 14.5 14.5 14.5 ZT20-23 28.8 28.8 28.8