condition mean min max ZT0-3 31.2 31.2 31.2 ZT4-7 20.5 20.5 20.5 ZT8-11 3.45 3.45 3.45 ZT12-15 9.9 9.9 9.9 ZT16-19 10.15 10.15 10.15 ZT20-23 3.5 3.5 3.5