condition mean min max ZT0-3 2.65 2.65 2.65 ZT4-7 37.5 37.5 37.5 ZT8-11 14.05 14.05 14.05 ZT12-15 6.15 6.15 6.15 ZT16-19 10.35 10.35 10.35 ZT20-23 7.8 7.8 7.8