condition mean min max ZT0-3 0.451153 0.451153 0.451153 ZT4-7 0.551304 0.551304 0.551304 ZT8-11 0.650632 0.650632 0.650632 ZT12-15 0.4332545 0.4332545 0.4332545 ZT16-19 0.4133615 0.4133615 0.4133615 ZT20-23 0.3161755 0.3161755 0.3161755