condition mean min max ZT0-3 23.1 23.1 23.1 ZT4-7 3.8 3.8 3.8 ZT8-11 40.5 40.5 40.5 ZT12-15 25.15 25.15 25.15 ZT16-19 24.65 24.65 24.65 ZT20-23 13.049999999999999 13.049999999999999 13.049999999999999