condition mean min max ZT0-3 856.2 856.2 856.2 ZT4-7 758.5 758.5 758.5 ZT8-11 839.75 839.75 839.75 ZT12-15 711.0 711.0 711.0 ZT16-19 529.8 529.8 529.8 ZT20-23 625.05 625.05 625.05