condition mean min max ZT0-3 21.005650000000003 21.005650000000003 21.005650000000003 ZT4-7 12.0332 12.0332 12.0332 ZT8-11 26.14425 26.14425 26.14425 ZT12-15 47.025549999999996 47.025549999999996 47.025549999999996 ZT16-19 48.083200000000005 48.083200000000005 48.083200000000005 ZT20-23 30.5175 30.5175 30.5175