condition mean min max ZT0-3 10.65 10.65 10.65 ZT4-7 24.6 24.6 24.6 ZT8-11 28.3 28.3 28.3 ZT12-15 46.6 46.6 46.6 ZT16-19 16.2 16.2 16.2 ZT20-23 26.65 26.65 26.65