condition mean min max ZT0-3 681.2 681.2 681.2 ZT4-7 788.6 788.6 788.6 ZT8-11 688.05 688.05 688.05 ZT12-15 739.0 739.0 739.0 ZT16-19 667.5 667.5 667.5 ZT20-23 610.2 610.2 610.2