condition mean min max ZT0-3 194.217138 194.217138 194.217138 ZT4-7 190.5507585 190.5507585 190.5507585 ZT8-11 172.148127 172.148127 172.148127 ZT12-15 243.10981750000002 243.10981750000002 243.10981750000002 ZT16-19 253.5971775 253.5971775 253.5971775 ZT20-23 249.196404 249.196404 249.196404