Variable	Modality	DRS-15			Total	chi-2
Variable	Modality	Law	Average	High	Total
Gender	Male	83	16	0	99	6.89 (p < 0.032)*
Gender	Female	104	21	6	131	6.89 (p < 0.032)*
Grade	Nurse	123	25	2	150	2.80 (p < 0.25) ns
Grade	Doctor	64	12	4	80	2.80 (p < 0.25) ns
Age	<25	21	8	0	29	10.16 (p < 0.25) ns
	25<>55	148	22	6	176
	>55	18	7	0	25
Marital status	Single	64	14	2	80	11.05 (p < 0.05)*
Marital status	Married	123	23	4	150	11.05 (p < 0.05)*
Seniority	<5	60	10	1	71	7.50 (p < 0.047)*
	5<>20	82	11	3	96
	>20	45	16	2	63
Transport tools	Auto	132	24	4	160	0.53 (p < 0.93)
Transport tools	By foot	55	13	2	70	0.53 (p < 0.93)
Hour of work	12/36	31	8	1	40	2.43 (p < 0.05)*
	Continue	127	25	5	157
	Normal	26	4	0	30
Antecedent	None	134	21	4	159	8.80 (p < 0.041)*
	HT	21	6	0	27
	Cancer	2	0	0	2
	Psychologic	3	1	1	5
Total		187	37	6	230