condition mean min max ZT0-3 18.0 18.0 18.0 ZT4-7 30.7 30.7 30.7 ZT8-11 11.85 11.85 11.85 ZT12-15 12.55 12.55 12.55 ZT16-19 36.0 36.0 36.0 ZT20-23 32.65 32.65 32.65