condition mean min max ZT0-3 10.336005 10.336005 10.336005 ZT4-7 10.61122 10.61122 10.61122 ZT8-11 8.813245 8.813245 8.813245 ZT12-15 8.60806 8.60806 8.60806 ZT16-19 12.318449999999999 12.318449999999999 12.318449999999999 ZT20-23 10.45025 10.45025 10.45025