INDEPTH Healthy Transitions to Adulthood Studies (IHTAS) The Health and Health behaviours of young people (13-24) in Kilifi Analysis Plan Mark Otiende

Questionnaire Alcohol consumption Cigarette and tobacco use Drug use (marijuana and glue) Major depression Inventory Cleaning teeth and hand washing practices Food and drinks Physical activities Free time activities Experiences at school and at home Physical fights Injuries in the past Bullying Marital status Pregnancy Sexual behaviors Anthropometric measures

Objective 1 To estimate the prevalence of alcohol and substance abuse among young people Limits of data1.Study population: year olds 2.Data type: Categorical (Ordinal and Nominal) Primary Endpoints1.Prevalence of alcohol consumption 2.Prevalence of tobacco 3.Prevalence of marijuana and sniffing glue usage Analysis sub-groups1.Age strata 2.Sex 3.Source of substance 4.Education 5.Anthropometric measures Analysis strategy: contingency tables & test for interaction

Objective 2 To assess the nutritional status and the dietary behaviors of young people Limits of data1.Study population: year olds 2.Data type: Categorical (Ordinal and Nominal) Primary Endpoints1.Prevalence of food inadequacy 2.Prevalence of consumption of fruits 3.Prevalence of consumption of vegetables 4.Prevalence of consumption of carbonated drinks 5.Prevalence of consumption of fast food Analysis sub-groups1.Age strata 2.Sex 3.Hygiene practices 4.Physical activities 5.Education 6.Anthropometric measures Analysis strategy: contingency tables & test for interaction

Objective 3 To describe the hygiene practices of young people Limits of data1.Study population: year olds 2.Data type: Categorical (Ordinal) Primary Endpoints1.Prevalence of oral health behaviors 2.Prevalence of hand washing behaviors (using soap; before eating; after using the latrine Analysis sub-groups1.Age strata 2.Sex 3.Substance use 4.Education 5.Anthropometric measures Analysis strategy: contingency tables & test for interaction

Objective 4 To determine the prevalence of major depression among young people Limits of data1.Study population: year olds 2.Data type: Categorical (Ordinal) Primary Endpoints1.Mean MDI total scores 2.Prevalence of DSM-IV major depression 3.*Cronbach’s alpha Analysis sub-groups1.Age strata 2.Sex 3.Substance use 4.Education 5.Anthropometric measures Analysis strategy: contingency tables & test for interaction

Objective 4 To determine the prevalence of major depression among young people

Objective 4 To determine the prevalence of major depression among young people

Objective 5 To describe how physical violence and unintentional injury affect young people Limits of data1.Study population: year olds 2.Data type: Categorical (Ordinal) Primary Endpoints1.Prevalence of Physical activities and sedentary behaviors 2.Prevalence of physical fights 3.Prevalence of physical injuries 4.Prevalence of bullying Analysis sub-groups1.Age strata 2.Sex 3.Substance use 4.Education 5.Anthropometric measures Analysis strategy: contingency tables & test for interaction

Objective 6 To describe the sexual behaviors (including sexual violence) that contribute to HIV infection, other STIs, and unintended pregnancies Limits of data1.Study population: year olds 2.Data type: Categorical (Ordinal and Nominal) Primary Endpoints1.Prevalence of pregnancies 2.Prevalence of sex, usage of contraceptives and other sexual behavior 3.Prevalence of unwilling sex, forcefully or otherwise Analysis sub-groups1.Age strata 2.Sex 3.Substance use 4.MDI 5.Education 6.Anthropometric measures Analysis strategy: contingency tables & test for interaction