condition mean min max ZT0-3 5.258201666666666 3.535275 7.87847 ZT4-7 2.927145 2.927145 2.927145 ZT8-11 0.86753 0.86753 0.86753 ZT12-15 0.210922 0.0 0.421844 ZT16-19 0.822647 0.822647 0.822647 ZT20-23 0.0 0.0 0.0