condition mean min max ZT0-3 5.7 5.7 5.7 ZT4-7 4.3 4.3 4.3 ZT8-11 47.3 47.3 47.3 ZT12-15 27.25 27.25 27.25 ZT16-19 14.3 14.3 14.3 ZT20-23 5.15 5.15 5.15