To produce each of those results, Catus runs a number of iterations (1000 in your case) of the simulation. Each iteration yields its own DPS figure, so across all of these iterations, the program obtains a distribution of DPS figures.

The

mean and

median are two measures of the central value of this distribution. Typically these will be close together; the main practical difference is that the median tends to suppress outliers.

The number after the "+/-" is the

standard error, i.e. the standard deviation of the mean. It's an estimate of how uncertain the given value for the mean is. So for example, if the mean is quoted as "254781 +/- 351.22", this means the true mean probably lies between 254781-351 and 254781+351.

The number in parentheses is the

standard deviation of the sample. It's an measure of the

dispersion of the distribution -- that is, how much the DPS figure varies between iterations. In a practical sense, it's an estimate for how much your DPS will vary from fight to fight (due to randomness alone).

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If none of this made sense to you, then just look at the median and ignore everything else.