Could you give further information? RMSD is always calculated against a reference structure or set of values. The set of values could , for instance , be average values for that particular bond angle or bond length (as defined by the atom types that make up that bond angle or bond length) as defined in the CSD. What is/are the reference in your case?
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I have got this result from PSVS server and tit has been calculated With respect to mean and standard deviation for a set of 252 X-ray structures < 500 residues, of resolution
OK, I don't know the output of the PSVS, so can only conjecture (perhaps someone who uses PSVS can also comment.)
So I assume, unless you can say otherwise, these are global values. In other words I imagine the RMSDs of each type of bond angle is first calculated, and then these are averaged to get 2.1 deg.
This figure of 2.1 deg is small which is probably a good sign. However you should also look for the corresponding Z-scores as well. This will tell you how many std deviations away from the mean this 2.1 deg represents, and so will tell you something of how the quality of your particular structure compares with the 252 std X-ray structures
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