condition mean min max ZT0-3 9.059155 9.059155 9.059155 ZT4-7 7.172775 7.172775 7.172775 ZT8-11 7.132009999999999 7.132009999999999 7.132009999999999 ZT12-15 8.417665 8.417665 8.417665 ZT16-19 9.4628 9.4628 9.4628 ZT20-23 9.29843 9.29843 9.29843