condition mean min max ZT0-3 9.85 9.85 9.85 ZT4-7 5.8 5.8 5.8 ZT8-11 10.6 10.6 10.6 ZT12-15 8.55 8.55 8.55 ZT16-19 25.45 25.45 25.45 ZT20-23 22.15 22.15 22.15