condition mean min max ZT0-3 24.05 24.05 24.05 ZT4-7 12.1 12.1 12.1 ZT8-11 12.55 12.55 12.55 ZT12-15 21.3 21.3 21.3 ZT16-19 14.85 14.85 14.85 ZT20-23 19.0 19.0 19.0