condition mean min max ZT0-3 12.153324 12.153324 12.153324 ZT4-7 14.9147815 14.9147815 14.9147815 ZT8-11 25.4391095 25.4391095 25.4391095 ZT12-15 32.302423000000005 32.302423000000005 32.302423000000005 ZT16-19 17.3322855 17.3322855 17.3322855 ZT20-23 17.962729500000002 17.962729500000002 17.962729500000002