condition mean min max ZT0-3 26.0 26.0 26.0 ZT4-7 27.4 27.4 27.4 ZT8-11 6.6 6.6 6.6 ZT12-15 35.7 35.7 35.7 ZT16-19 18.1 18.1 18.1 ZT20-23 24.5 24.5 24.5