condition mean min max ZT0-3 17.8 17.8 17.8 ZT4-7 25.6 25.6 25.6 ZT8-11 5.0 5.0 5.0 ZT12-15 9.8 9.8 9.8 ZT16-19 24.4 24.4 24.4 ZT20-23 26.1 26.1 26.1