condition mean min max ZT0-3 456.5 456.5 456.5 ZT4-7 859.4 859.4 859.4 ZT8-11 775.2 775.2 775.2 ZT12-15 713.35 713.35 713.35 ZT16-19 593.65 593.65 593.65 ZT20-23 572.4 572.4 572.4