condition mean min max ZT0-3 9.262550000000001 8.47687 10.50145 ZT4-7 7.66843 7.66843 7.66843 ZT8-11 6.791425 6.791425 6.791425 ZT12-15 7.3220325 5.683475 8.96059 ZT16-19 5.61087 5.61087 5.61087 ZT20-23 9.762699999999999 9.762699999999999 9.762699999999999