condition mean min max ZT0-3 44.5 44.5 44.5 ZT4-7 34.9 34.9 34.9 ZT8-11 17.55 17.55 17.55 ZT12-15 25.9 25.9 25.9 ZT16-19 33.65 33.65 33.65 ZT20-23 11.45 11.45 11.45