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Isa Furey

Isa Furey. Logistic Regression Analysis. “Familial Correlates of Extreme Weight Control Behaviors among Adolescents”. By: Helena Fonseca, Marjorie Ireland, & Michael D. Resnick. International Journal of Eating Disorders Vol. 32, Issue 4. Physical problems Menstrual irregularities

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Isa Furey

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  1. Isa Furey Logistic Regression Analysis

  2. “Familial Correlates of Extreme Weight Control Behaviors among Adolescents” By: Helena Fonseca, Marjorie Ireland, & Michael D. Resnick International Journal of Eating Disorders Vol. 32, Issue 4

  3. Physical problems Menstrual irregularities Growth retardation Delayed sexual maturation Psychological disturbances Decrease in self-esteem Poor concentration Disturbed sleep patterns Introduction Extreme dieting leads to…

  4. Introduction GOAL • To identify risk factors • To seek treatment early • To prevent eating disorders

  5. Being female Body dissatisfaction Low self-esteem Need for social approval History of physical/ sexual abuse Substance abuse Suicide attempts Introduction Past Behaviors/Factors

  6. Objective • To identify possible familial factors associated with extreme weight control among adolescents.

  7. 1995-1996 Survey: Voice of Connecticut Youth 225-item assessment 25 random geographic/ socio-economic strata Public school system Grades 7, 9, & 11 Classroom setting Anonymous Only group results to be reported n = 9,943 (~83% of enrolled students) Methods: Data Collection Study Population & Design

  8. Methods: This Study • Excluded data • Weights < 25 lbs • Body Mass Index (BMI) < 10 or BMI >50 • Final Sample n = 9,042 students • 4,625 girls • 4,417 boys

  9. Family communication Parental supervision & monitoring Family connectedness Perceived caring & communication w/ other adults, friends Parental expectations Sexual/ physical abuse Weight control behaviors Other factors Methods: Measurement

  10. Methods: Data Analysis • Logistic regression • Response variable Y=1 (extreme weight control behaviors) or 0 (no extreme weight control behaviors) • Probability of success or of extreme weight control behaviors • Stratified by gender

  11. Number and percent of respondents engaged in weight control behaviors

  12. Comparison of mean values for age & BMI between index & control groups

  13. Comparison of mean values or scaled constructs between index & control groups

  14. Comparison of mean values or scaled constructs between index & control groups

  15. Multivariate logistic regression results: boys

  16. Logistic Regression • Response variable Y=1 (extreme weight control be-haviors) or 0 (no extreme weight control behaviors) • Probability of success or of exhibiting extreme weight control behaviors • ln p/(1-p) = + x

  17. Multivariate logistic regression results: boys (cont.) ln p/(1-p) =+1.273x1-.810x2-.884x3–1.551x4+1.010x5

  18. Multivariate logistic regression results: girls

  19. Multivariate logistic regression results: girls (cont.) ln p/(1-p) =+.775x1-1.339x2-1.398x3–.553x4+.372x5

  20. Risk Factors Parental Supervision History of sexual abuse Protective Factors Connectedness w/ adults, friends Mother in home Parental expectations Risk Factors BMI History of sexual abuse Protective Factors Family communication Family connectedness Mother in home Conclusions Boys Girls

  21. Conclusions • Identified risk factors • Identified protective factors • Significant evidence to investigate

  22. Height & weight self reported-possible error Deliberate Unintentional School-based survey Dropouts Absentees Questions asked Fasting Skipping meals Exercising to exhaustion Location of survey Cannot make causal inferences Limitations

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