condition mean min max ZT0-3 1.3820934999999999 1.3820934999999999 1.3820934999999999 ZT4-7 2.27108 2.27108 2.27108 ZT8-11 0.5087010000000001 0.5087010000000001 0.5087010000000001 ZT12-15 1.162265 1.162265 1.162265 ZT16-19 0.5964255 0.5964255 0.5964255 ZT20-23 0.662954 0.662954 0.662954