SUMMARYThis study reports the expressions for the variances in the prediction of the response and predictor variables calculated with the bivariate least squares (BLS) regression technique. This technique takes into account the errors on both axes. Our results are compared with those of a simulation process based on six different real data sets. The mean error in the results from the new expressions is between 4% and 5%. With weighted least squares, ordinary least squares, the constant variance ratio approach and orthogonal regression, on the other hand, mean errors can be as high as 85%, 277%, 637% and 1697% respectively. An important property of the prediction intervals calculated with BLS is that the results are not affected when the axes are switched.

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Background: For school medical services and the staff responsible for sex education for adolescents, it is important to understand the factors that may influence gender violence. The aim of this study is to determine whether the presence of sexist attitudes, double standards and/or romantic myths contributes to the risk of gender violence. Methods: This cross-sectional study was carried out at five secondary schools in the province of Malaga (Spain). In total, 879 adolescents aged 12–18 years were included, studying years 1–4 of compulsory secondary education. Their attitudes were measured on the following scales: Ambivalent Sexism Inventory (ASI), Double Standard Scale (DSS) and Romantic Love Myths Scale (EMA). Results: Significant differences were observed among the age/year groups for the mean scores obtained on each of the above scales (DSS, p < 0.01; EMA, p < 0.01; ASI, p < 0.01). By gender, the boys recorded higher scores for ASI and lower ones for DSS (p < 0.01). The Spearman’s rho value revealed significant relationships between the presence of sexual double standards and that of romantic myths and ambivalent attitudes (p < 0.01). Conclusions: Adolescents commonly express romantic love myths, sexist attitudes and sexual double standards. These three factors, which are significantly correlated, influence the presence of violence in dating relationships.

We found a 19.6% mortality in the TICU. Cranial and abdominal/pelvic injury and age over 65 were the main risk factors on admittance. Clinically, we finally agreed with the majority of TRISS outcome predictions. However, we could not statistically validate the apparent clinical goodness of the TRISS methodology.