condition mean min max ZT0-3 8.596577499999999 7.8129100000000005 9.380244999999999 ZT4-7 9.412424999999999 9.412424999999999 9.412424999999999 ZT8-11 9.216225000000001 9.216225000000001 9.216225000000001 ZT12-15 0 0 0 ZT16-19 9.156939999999999 9.156939999999999 9.156939999999999 ZT20-23 10.638124999999999 10.638124999999999 10.638124999999999