condition mean min max ZT0-3 41.9 41.9 41.9 ZT4-7 17.4 17.4 17.4 ZT8-11 34.25 34.25 34.25 ZT12-15 39.75 39.75 39.75 ZT16-19 25.9 25.9 25.9 ZT20-23 14.05 14.05 14.05