condition mean min max ZT0-3 37.85 37.85 37.85 ZT4-7 19.2 19.2 19.2 ZT8-11 20.3 20.3 20.3 ZT12-15 18.65 18.65 18.65 ZT16-19 13.6 13.6 13.6 ZT20-23 14.0 14.0 14.0