condition mean min max ZT0-3 666.0 666.0 666.0 ZT4-7 652.4 652.4 652.4 ZT8-11 612.1 612.1 612.1 ZT12-15 638.75 638.75 638.75 ZT16-19 624.85 624.85 624.85 ZT20-23 820.55 820.55 820.55