Isa Furey Logistic Regression Analysis. “Familial Correlates of Extreme Weight Control Behaviors among Adolescents” By: Helena Fonseca, Marjorie Ireland,

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Presentation transcript:

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

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

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

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

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

Methods: Data Collection 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) Study Population & Design

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

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

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 Methods: Data Analysis

Number and percent of respondents engaged in weight control behaviors Girls n (%) Boys n (%) ²² p Value Dieted1,766 (38.2) 548 (12.4)822.00<.001 Exercised2,824 (61.1)1,889 (42.8)304.60<.001 Made yourself vomit 186 ( 4.0) 75 ( 1.7)45.00<.001 Took diet pills 175 ( 3.8)50 ( 1.1)69.50<.001 Took laxatives or diuretics 62 ( 1.3)71 ( 1.6)

VariableIndex GroupControlsp Value Age Girls Boys BMI Girls Boys Comparison of mean values for age & BMI between index & control groups

Comparison of mean values or scaled constructs between index & control groups Variable Index GroupControlsp Value Parental supervision/monitoring Girls Boys <.001 Family connectedness Girls Boys <.001

Variable Index GroupControlsp Value Family communication Girls Boys <.001 Connectedness w/ friends, adults Girls Boys <.001 Parental expectations Girls Boys <.001 Comparison of mean values or scaled constructs between index & control groups

Multivariate logistic regression results: boys VariableOdds Ratio95% C.I.p Value Age , BMI , Parental supervision/monitoring ,7.39<.001 Connectedness with adults, friends , Mother in home ,0.66<.001 Parental Expectations ,0.43<.001 History of sexual abuse ,3.93<.001

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

Multivariate logistic regression results: boys (cont.) Variable  Odds Ratiop Value Age BMI Parental supervision/monitoring <.001 Connectedness with adults, friends Mother in home <.001 Parental Expectations <.001 History of sexual abuse <.001 ln p/(1-p) =   x  x  x 3 –1.551  x  x 5

Multivariate logistic regression results: girls VariableOdds Ratio95% C.I.p Value Age , BMI , Family communication ,0.57<.001 Family connectedness ,0.49<.001 Mother in home , History of sexual abuse ,1.74<.001

Variable  Odds Ratiop Value Age BMI Family communication <.001 Family connectedness <.001 Mother in home History of sexual abuse <.001 Multivariate logistic regression results: girls (cont.) ln p/(1-p) =   x  x  x 3 –.553  x  x 5

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 BoysGirls

Identified risk factors Identified protective factors Significant evidence to investigate Conclusions

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