condition mean min max ZT0-3 220.1 220.1 220.1 ZT4-7 137.3 137.3 137.3 ZT8-11 75.5 75.5 75.5 ZT12-15 130.5 130.5 130.5 ZT16-19 148.9 148.9 148.9 ZT20-23 185.75 185.75 185.75