condition mean min max ZT0-3 1.9428299999999998 1.9428299999999998 1.9428299999999998 ZT4-7 1.0979425 1.0979425 1.0979425 ZT8-11 0.743007 0.743007 0.743007 ZT12-15 0.7591574999999999 0.7591574999999999 0.7591574999999999 ZT16-19 1.797855 1.797855 1.797855 ZT20-23 1.908305 1.908305 1.908305