condition mean min max ZT0-3 24.683207 24.683207 24.683207 ZT4-7 34.900681000000006 34.900681000000006 34.900681000000006 ZT8-11 45.8494925 45.8494925 45.8494925 ZT12-15 37.6736485 37.6736485 37.6736485 ZT16-19 38.7624115 38.7624115 38.7624115 ZT20-23 27.103247000000003 27.103247000000003 27.103247000000003