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Need Help With 3rd Year Chemistry group project

So my group project is based on the use of the CSD to identify trends within certain crystal structures. one of the questions posed to me was "How do bite anglesfor 2,2’-bipy and 1,10-phenanthroline vary for a 1^st row transitionmetals?". I've collected and tabulated all the data, but I'm unsure as to how to explain the results. there doesn't seem to be a clear trend going along the first row. The average bite angles for 2,2’-bipy are as follows:
Sc 72.653 Ti 72.867 V 73.946 Cr 78.59 Mn 73.451 Fe 79.844 Co 78.781 Ni 79.258 Cu 80.559 Zn 77.114 and the for 1,10-phenanthroline:
Sc 69.535 Ti 74.462 V 74.111 Cr 79.876 Mn 73.272 Fe 80.695 Co 79.017 Ni 79.759 Cu 81.07 Zn 77.719 I have a feeling i may be looking at this the wrong way and should ignore any trends, instead looking at each metals electron arrangement. but i'm unsure.
could anybody please help