Table 1: The mean and standard deviation of age based on years.

Year	Number	Mean	S.D.
2010	183	52.22	14.71
2011	257	50.35	14.74
2012	319	49.30	13.59
2013	280	53.01	14.96
2014	215	52.10	12.31
Total	1254	51.25	14.16