condition mean min max ZT0-3 11.35 11.35 11.35 ZT4-7 8.6 8.6 8.6 ZT8-11 25.5 25.5 25.5 ZT12-15 4.85 4.85 4.85 ZT16-19 4.55 4.55 4.55 ZT20-23 11.8 11.8 11.8