condition mean min max ZT0-3 6.732044999999999 6.732044999999999 6.732044999999999 ZT4-7 1.883155 1.883155 1.883155 ZT8-11 3.252265 3.252265 3.252265 ZT12-15 6.34732 6.34732 6.34732 ZT16-19 6.09864 6.09864 6.09864 ZT20-23 5.43807 5.43807 5.43807