condition mean min max ZT0-3 10.35 10.35 10.35 ZT4-7 8.4 8.4 8.4 ZT8-11 4.55 4.55 4.55 ZT12-15 7.65 7.65 7.65 ZT16-19 5.9 5.9 5.9 ZT20-23 46.95 46.95 46.95