condition mean min max ZT0-3 31.75 31.75 31.75 ZT4-7 55.8 55.8 55.8 ZT8-11 11.7 11.7 11.7 ZT12-15 14.4 14.4 14.4 ZT16-19 41.65 41.65 41.65 ZT20-23 67.55 67.55 67.55