condition mean min max ZT0-3 27.4 27.4 27.4 ZT4-7 12.8 12.8 12.8 ZT8-11 18.4 18.4 18.4 ZT12-15 23.2 23.2 23.2 ZT16-19 15.45 15.45 15.45 ZT20-23 24.8 24.8 24.8