condition mean min max ZT0-3 618.385903 618.385903 618.385903 ZT4-7 702.4362625 702.4362625 702.4362625 ZT8-11 1165.917912 1165.917912 1165.917912 ZT12-15 1060.263457 1060.263457 1060.263457 ZT16-19 1167.9298005 1167.9298005 1167.9298005 ZT20-23 1106.251347 1106.251347 1106.251347