condition mean min max ZT0-3 13.85 13.85 13.85 ZT4-7 36.4 36.4 36.4 ZT8-11 50.7 50.7 50.7 ZT12-15 8.05 8.05 8.05 ZT16-19 13.0 13.0 13.0 ZT20-23 6.35 6.35 6.35