Table 2 Mean number of referrals per 12-month period in the DELPHI database (1 July 2007–30 June 2012), n = 87258 patients

	#Patients	%Patients	Mean	Standard Deviation
Sex
Males	34685	39.6	0.26	0.43
Females	52573	60.4	0.31	0.47
Age Group
0–19	18872	21.6	0.15	0.3
20–44	28147	32.3	0.27	0.43
45–64	26234	30.1	0.34	0.49
65+ years	14005	16.1	0.42	0.57
Number of Chronic Conditions
0	52908	60.6	0.24	0.41
1	21354	24.5	0.34	0.48
2	9154	10.5	0.40	0.53
3	3011	3.5	0.46	0.60
4+	831	1.0	0.52	0.72
Practice Location
Urban	78664	90.2	0.31	0.47
Rural	8594	9.8	0.13	0.28