condition mean min max ZT0-3 29.0 29.0 29.0 ZT4-7 7.3 7.3 7.3 ZT8-11 37.5 37.5 37.5 ZT12-15 24.0 24.0 24.0 ZT16-19 4.25 4.25 4.25 ZT20-23 17.0 17.0 17.0