condition mean min max ZT0-3 17.65 17.65 17.65 ZT4-7 9.4 9.4 9.4 ZT8-11 22.8 22.8 22.8 ZT12-15 6.65 6.65 6.65 ZT16-19 16.45 16.45 16.45 ZT20-23 25.85 25.85 25.85