condition mean min max ZT0-3 13.6 13.6 13.6 ZT4-7 0.4 0.4 0.4 ZT8-11 0.9500000000000001 0.9500000000000001 0.9500000000000001 ZT12-15 5.55 5.55 5.55 ZT16-19 5.85 5.85 5.85 ZT20-23 16.35 16.35 16.35