The variables included in the initial logistic regression models were as follows: gender, birth weight, birth order, breastfeeding, age at leukaemia diagnosis, infection during the first year of life, cardiopathies, stacking level, maternal information (age at child's birth, education, occupation, and smoking), and paternal information (education, occupation, and smoking).
The first complex included six questions about general information: age, gender of the child and special health care needs (general disease, preterm birth, syndromal diseases).
Because birth order and sex composition of siblings have been shown to be related to educational outcomes (Butcher and Case 1994; Alderman and King 1998) we disaggregate the information on presence of school age children in the household into four different dummy variables: older female sibling, older male sibling, younger female sibling, and younger male sibling.
The independent variables are divided into the following: personal information (age, marital status, number of children and educational levels); close environment variables (size of the locality); variables that reflect the economic sector and a variable that indicates the ethnic status (1 if speak indigenous language, that is, if person is indigenous, 0 for the other case).
Prior to the interview with the mothers, they provided the following information: age, education level, number of children, a record of attended prenatal visits and place of delivery.
Parents were asked to complete a questionnaire (attached as Additional file 1) that included (i) demographic information (age and gender of the child and education level of parents); (ii) oral health-related behaviours (the child's snacking habits, tooth brushing practice, and dental visit), and (iii) perceived oral health of the child.
Based on the Ecologic Model of Sedentary Behavior [ 14], child demographic information (age, gender) were entered at step 1, representing intrapersonal level factors.
This was confirmed by adult participants in this study, who indicate that they normally get risk information from their school-age children.
In the United States, routine use of annual influenza vaccine in preschool children has only recently been introduced; information focusing on school-age children is limited (21 ).
This methodological model allowed identifying the needs of school-age children on information and participation in activities.
In Guyana, the 'TELL Campaign' has reached over 9,000 primary-school-age children with information about sexual abuse, empowering them to report abuse.
