condition mean min max ZT0-3 37.05 37.05 37.05 ZT4-7 11.5 11.5 11.5 ZT8-11 22.5 22.5 22.5 ZT12-15 12.2 12.2 12.2 ZT16-19 17.0 17.0 17.0 ZT20-23 23.45 23.45 23.45