condition mean min max ZT0-3 751.0999999999999 751.0999999999999 751.0999999999999 ZT4-7 626.8 626.8 626.8 ZT8-11 711.5 711.5 711.5 ZT12-15 702.45 702.45 702.45 ZT16-19 721.8 721.8 721.8 ZT20-23 806.7 806.7 806.7