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BIAS FAQUNIVERSITAT DE BARCELONA BIAS. Body Image Assessment Software Alex Letosa, Jos Gutirrez-Maldonado and Marta Ferrer University of Barcelona 1) Which tool do you suggest for measuring the real body sizes of the subjects? This question arises from the problem, that we measured the body size with a tape measure, which provides very imprecise values, because one does not know where exactly the tape measure has to be located. Would it be better to use a tool which allows to obtain diameters for waist, hip or arms instead of circumferences?The best instrument for the measurement of the body parts is a calliper, you can find a variety of medical callipers. You can use a vernier calliper as well. They have to be big enough.In the next figure you can find the locations of the measures:Dont take circumferences as measures, the right ones are diameters (for width measures). If you have doubts about where to take the measure, apply the rule of the wider place for head width, head profile, arm width, breast width, breast profile, hip width, hip profile, thigh width and thigh profile; and the narrower for the waist width and waist profile.2) The figure on the screen had no legs, there was no more room for them on the screen. It has to be noted that the height of the subject was entered as 180 cm.BIAS detects the resolution of your computers screen and builds the image taking it into account, so the image built is allocated appropriately in the screen. In order to see the entire image you have to extend the window of BIAS to full screen mode (in the same way that you do it with any other Windows application):3) When entering the subjective values under “gender” there is the possibility to choose between “female” and “male”. But if you choose “male” the figure of your software, which the male subject is asked to modify, does not change in its important characteristics. Although we do not plan to work with male subjects, I think there could be an interest to apply your software to them, because of their increasing number of eating disorder patients. I suppose it would be more authentic and the subjects could better identify with the figure, if a figure could be presented with more male characteristics, at least without a female breast.You are right. At this moment BIAS only generates a female figure. We are working to include in next versions of BIAS the possibility of building male figures as well.4) The analysis by your software is based on average weight psychology students. If, however one includes students with eating disorders the question arises, to what extent do subjects with anorexia nervosa or obese women identify the figure as a representation of their own body? I. e. to which degree do you disclose that the figure is based on the subjects real measures entered into the program? We have collected data with samples of university students. If we consider the prevalence rates of eating disorders, some of them where at last in risk or in fact had any kind of eating disorder. Anyway, the objective of BIAS is the estimation of distortion and dissatisfaction indexes, so if a person with anorexia nervosa, for example, do not identify the figure built by BIAS with her real measures, this will be reflected in a high distortion index. As you can see in the instructions of the “perceived body image task”, we dont tell the subject that the figure in the screen corresponds to a proportional representation of her real measures, we only say that she has to modify it until she thinks that it represents accurately a proportional representation of her body. If her body image is not distorted, she will not modify it, because she will notice that the figure is actually a proportional representation of her real body. If she has a body image distortion, shell modify the image and BIAS will calculate the distortion index. 5) How are the outcome numbers interpreted, i.e. what do the figures in the results line represent? Inside “Edit /View subjects measurements”, clicking on “History assessments” youll be able to view (and copy) the previous assessments of this subject. The entire data table (all of the subjects and assessments) can be opened by clicking on “View results”. It is possible, as well, to export the entire data table to an Excel file by clicking on “Export data”. This action will save a file (BIASDATA.xls) in c: The interpretation of the outcome numbers can be done as follows:In this example, the total perceived frontal body image of 91.66 means that the perceived frontal image of this subject is 91.66% of her real mean frontal size. It can be expressed as a distortion index of -8.33 (-8.33 = 91.66 - 100). The perceived side (profile) image is 100, meaning that it is 100% of her real mean side size, so the distortion index is 0. The total perceived body image is 95.83% of her real body size, so the total distortion index is -4.16. The desired body image is 105, meaning that she would like to be 5% bigger than she is actually. So the dissatisfaction index is 9.16, obtained substracting the perceived body image (95.83) from the desired body image (105). In the same way, dissatisfaction indexes are obtained for frontal and side body parts. Distortion and dissatisfaction indexes are calculated by BIAS when new perceived body image assessments or desired body image assessments ar
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