condition mean min max ZT0-3 37.2 37.2 37.2 ZT4-7 18.1 18.1 18.1 ZT8-11 16.6 16.6 16.6 ZT12-15 20.05 20.05 20.05 ZT16-19 27.45 27.45 27.45 ZT20-23 7.65 7.65 7.65