condition mean min max ZT0-3 1.32849 1.32849 1.32849 ZT4-7 9.71763 9.71763 9.71763 ZT8-11 4.982585 4.982585 4.982585 ZT12-15 0.3424255 0.3424255 0.3424255 ZT16-19 0.04643475 0.04643475 0.04643475 ZT20-23 0.14974145 0.14974145 0.14974145