condition mean min max ZT0-3 18.95 18.95 18.95 ZT4-7 5.1 5.1 5.1 ZT8-11 24.25 24.25 24.25 ZT12-15 14.8 14.8 14.8 ZT16-19 29.2 29.2 29.2 ZT20-23 30.65 30.65 30.65