condition mean min max ZT0-3 23.3 23.3 23.3 ZT4-7 10.9 10.9 10.9 ZT8-11 12.95 12.95 12.95 ZT12-15 12.4 12.4 12.4 ZT16-19 28.65 28.65 28.65 ZT20-23 5.55 5.55 5.55