condition mean min max ZT0-3 876.5 876.5 876.5 ZT4-7 727.8 727.8 727.8 ZT8-11 674.95 674.95 674.95 ZT12-15 750.15 750.15 750.15 ZT16-19 920.55 920.55 920.55 ZT20-23 849.75 849.75 849.75