condition mean min max ZT0-3 9.45 9.45 9.45 ZT4-7 37.3 37.3 37.3 ZT8-11 19.05 19.05 19.05 ZT12-15 19.7 19.7 19.7 ZT16-19 23.65 23.65 23.65 ZT20-23 27.65 27.65 27.65