condition mean min max ZT0-3 30.125471 30.125471 30.125471 ZT4-7 32.8778845 32.8778845 32.8778845 ZT8-11 53.608064999999996 53.608064999999996 53.608064999999996 ZT12-15 77.812675 77.812675 77.812675 ZT16-19 52.869813 52.869813 52.869813 ZT20-23 37.6627445 37.6627445 37.6627445