condition mean min max ZT0-3 16.3 16.3 16.3 ZT4-7 7.8 7.8 7.8 ZT8-11 7.7 7.7 7.7 ZT12-15 7.5 7.5 7.5 ZT16-19 37.55 37.55 37.55 ZT20-23 23.95 23.95 23.95