Table 2.

Demographic characteristics of included patient in the ARAS cohort by the three study centers.

	Tabriz (n = 196)		Kermanshah (n = 149)		Tehran (n = 155)		Total (n = 500)		p
	Mean/%	SD/N	Mean/%	SD/N	Mean/%	SD/N	Mean/%	SD/N
Age	29.7	11.2	33.4	9.3	36.3	10.4	32.3	9.7	0.004
Gender (% male)	62.8	123	76.5	114	85.8	133	74.0	370	0.005
Ethnicity
Azeri	94.4	185	1.3	2	16.8	26	42.6	213	0.005
Kurd	5.1	10	85.2	127	5.8	9	29.2	146
Fars	0.5	1	6.7	10	62.6	97	21.6	108
Lor	0	0	1.3	2	9.7	15	3.4	17
Other	0	0	5.4	8	5.2	8	3.2	16
Marital status
Single	60.7	119	48.3	72	60.6	94	57.0	285	0.05
Married	26.0	51	38.3	57	23.9	37	29.0	145
Separated	2.0	4	1.3	2	13.5	21	5.4	27
Divorced	9.7	19	11.4	17	1.3	2	7.6	38
Widowed	1.5	3	0.7	1	0.6	1	1.0	5
Number of children
0	11	14.5	24	31.1	14	22.9	49	22.2	0.338
1	27	35.5	18	23.3	19	31.4	64	30.1
2	25	32.9	23	29.8	21	34.4	69	31.8
3 or more	13	17.1	12	15.9	7	11.4	32	15.9
Living situation
Original Family	66.3	130	57.0	85	78.1	121	67.2	336	0.998
Spouse/children	27.0	53	36.2	54	3.2	5	22.4	112
Alone	6.1	12	5.4	8	7.1	11	6.2	31
Other	0.5	1	1.4	2	11.6	18	4.2	21
Educational level
Lower	38.8	76	50.	75	36.1	56	43.6	207	0.058
Middle	50.3	90	35.6	53	52.9	82	45.8	225
Higher	22.6	30	14.1	21	10.9	17	13.4	68
Day time activity
Paid job	24.1	47	47.6	71	53.5	83	40.2	201	0.005
Student	16.3	32	1.3	2	2.5	4	7.6	38
No job	33.2	65	36.9	55	42.6	66	37.2	186
Housewife	26.5	52	14.1	21	1.3	2	15.0	75
Socioeconomical level
Low	82.1	161	76.5	114	69.0	107	76.4	382	0.005
Middle	3.1	6	16.8	24	18.1	28	11.6	58
High	14.8	29	7.3	11	12.9	20	12.0	60