condition mean min max ZT0-3 41.8 41.8 41.8 ZT4-7 9.6 9.6 9.6 ZT8-11 19.4 19.4 19.4 ZT12-15 38.8 38.8 38.8 ZT16-19 35.45 35.45 35.45 ZT20-23 10.75 10.75 10.75