condition mean min max ZT0-3 27.3 27.3 27.3 ZT4-7 74.3 74.3 74.3 ZT8-11 21.25 21.25 21.25 ZT12-15 13.15 13.15 13.15 ZT16-19 33.5 33.5 33.5 ZT20-23 47.65 47.65 47.65