Table 1. The frequency of systemic diseases among patients referred to three different cities of Tehran, Mashhad, and Kerman.

		Kerman	Mashhad	Tehran
Cardiac Disease	No	4824	4407	4675
	Yes	1087	182	220
Rheumatic Fever	No	5423	4558	4880
	Yes	488	31	33
Renal disease	No	5701	4479	4803
	Yes	210	110	102
Asthma	No	5423	4553	4836
	Yes	488	36	71
Hepatitis	No	5374	4528	4835
	Yes	537	61	71
Diabetes	No	5620	4502	4822
	Yes	291	87	89
Neurologic Disease	No	5016	4447	4847
	Yes	895	142	62
Hypertension	No	5470	4218	4617
	Yes	441	371	287
Hematologic Disease	No	5847	4555	4873
	Yes	64	34	33
Gastric Disease	No	5479	4576	4913
	Yes	432	13	0
Allergy	No	5526	4370	4546
	Yes	385	219	367
Other Diseases	No	5711	4348	4614
	Yes	200	241	299
Medication	No	5176	4051	3710
	Yes	735	538	1203