condition mean min max ZT0-3 28.0 28.0 28.0 ZT4-7 27.9 27.9 27.9 ZT8-11 15.45 15.45 15.45 ZT12-15 11.5 11.5 11.5 ZT16-19 13.4 13.4 13.4 ZT20-23 6.15 6.15 6.15