condition mean min max ZT0-3 2470.1516666666666 2229.96 2722.23 ZT4-7 2181.9049999999997 2181.9049999999997 2181.9049999999997 ZT8-11 1952.53 1952.53 1952.53 ZT12-15 2055.9025 1900.785 2211.02 ZT16-19 2196.385 2196.385 2196.385 ZT20-23 2063.835 2063.835 2063.835