condition mean min max ZT0-3 27.1 27.1 27.1 ZT4-7 27.6 27.6 27.6 ZT8-11 60.8 60.8 60.8 ZT12-15 64.25 64.25 64.25 ZT16-19 67.8 67.8 67.8 ZT20-23 63.2 63.2 63.2