condition mean min max ZT0-3 17.65 17.65 17.65 ZT4-7 5.6 5.6 5.6 ZT8-11 35.75 35.75 35.75 ZT12-15 31.1 31.1 31.1 ZT16-19 16.6 16.6 16.6 ZT20-23 17.75 17.75 17.75