condition mean min max ZT0-3 45.3 45.3 45.3 ZT4-7 38.5 38.5 38.5 ZT8-11 21.55 21.55 21.55 ZT12-15 31.9 31.9 31.9 ZT16-19 47.3 47.3 47.3 ZT20-23 51.25 51.25 51.25