Vafaee-Najar et al. Table 1: Distribution of case and control by sex and age. Age (Years) Case Control Female Male Female No. (%) No. (%) No. (%) <20 0 3 (2.5) 2 (8) 20-29 4 (10.8) 20 (16.5) 8 (32) 30-39 32 (59.9) 49 (40.5) 1 (4) 40-49 9 (24.3) 30 (24.8) 14 (56) 50-59 2 (5.4) 16 (13.2) 0 >60 0 3 (2.5) 0 37 (100) 121 (100) 25 (100) not indicate any significant relationship between the risk and injuries with sex in the case and control group (p>0.05). The mean of the case group was 35.3±10.5 and in the control group was 39.4±9.8. The average age of the participants in the case group and control group was statistically different (p<0.001). As is indicated in Table 2, 42.9% of the case group used seat belts at the time of the accident but this amount was 62.7% in the control group. This difference was statistically significant (OR=0.44) in a single variable model. To rephrase, it can be asserted that the chance of getting injuries in the case of not using seat belts in comparison to using seat belts was Table 2: Distribution of case and control by risk factors. Risk Factor Male No. (%) 5 (3.9) 45 (34.9) 45 (34.9) 22 (17.1) 10 (7.8) 2 (1.6) 129 (100) Total 10 (3.2) 77 (24.7) 117 (37.5) 24 (75) 28 (9) 5 (1.6) 312 (100) 2.5 times more. The relationship between sex and not using seat belts in getting injuries was statistically significant in males (p<0.001). In Table 3 the related results to inju- ries and investigated variables were indicated in sin- gle and multi-variable logistic regression model. It is worth mentioning that fastening seat belt was approx- imately 5 times more in women, of course the rela- tionship between not fastening seat belt and getting injuries can not be due to the interfering effect of sex, since there was no significant relationship between this event and sex. As was shown in Tables 1, 2 and 3, the model of the car did not have any statistical sig- Sex Fastening seat belt Trapping in the car Falling out of the car Car Model Firing in accidents listening to music Smoking Using hand phone Time of accident Direction of contact Total 532 Male Female No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes 8-12 12-18 18-24 Behind Front Next Case No. (%) 129 (83.8) 25 (16.2) 88 (57.1) 66 (42.9) 107 (69.5) 47 (30.5) 109 (70.8) 45 (29.2) 69 (44.8) 85 (55.2) 121 (79.1) 32 (20.9) 76 (49.4) 78 (50.6) 96 (62.7) 57 (37.3) 131 (85.1) 23 (14.9) 63 (40.9) 26 (16.9) 65 (42.2) 38 (24.7) 84 (54.5) 32 (20.8) 154 (100) Control No. (%) 121 (76.6) 37 (23.4) 59 (37.3) 99 (62.7) 133 (84.2) 25 (15.8) 149 (94.3) 9 (5.7) 77 (48.7) 81 (51.3) 156 (98.7) 2 (1.3) 86 (54.4) 72 (45.6) 136 (86.1) 22 (13.9) 137 (80.4) 31 (19.6) 64 (40.5) 59 (37.3) 35 (22.2) 67 (42.4) 48 (30.4) 43 (27.2) 158 (100) WWW.ircmj.com Vol 13 August 2011