condition mean min max ZT0-3 6.15 6.15 6.15 ZT4-7 17.9 17.9 17.9 ZT8-11 14.15 14.15 14.15 ZT12-15 8.5 8.5 8.5 ZT16-19 29.95 29.95 29.95 ZT20-23 4.5 4.5 4.5