condition mean min max ZT0-3 2.2246595 1.087215 3.53883 ZT4-7 0.9665975 0.9665975 0.9665975 ZT8-11 2.990775 2.990775 2.990775 ZT12-15 4.384225 1.495455 7.272995 ZT16-19 6.13785 6.13785 6.13785 ZT20-23 2.159015 2.159015 2.159015