Sociodemographic variables included age, sex, height, weight, region of residence, school type and grade, socioeconomic status, perceived stress and whether the family lives together.
Demographic and social variables were evaluated (e.g., age, weight, place of residence, marital status, education, employment status, number of children, planning of future pregnancies, unintended pregnancies, abortions and stability of relationship with partner).
Table 3 shows the final multiple regression model predicting the log thymic index as a function of the lipid-adjusted PCB sum, adjusting for sex of infant, maternal smoking and alcohol history, Romani ethnicity, gestational age, Z-score of birth weight, district of residence, and maternal respiratory infection history during pregnancy or the 3 months before pregnancy.
ADHD was statistically significantly related to higher rate of overweight, when ADHD was treated as a single factor and in models taking into consideration the influence of birth weight, place of residence, parents' education and income level [unadjusted model OR (odds ratio) = 2.31, 95 % CI 1.40 3.81, p = 0.001; adjusted model: OR = 2.44, 95 % CI 1.38 4.29, p = 0.002].
wxz Distance weight from location of residence x to location of job z. nzj Number of vacancies advertised in year j with location z.
wab Transition probability from training a to occupation b. wxz Distance weight from location of residence x to location of job z. nbzj Number of vacancies advertised in year j in occupation b and location z.
Cesarean section deliveries were significantly associated with higher maternal age, primiparity, low birth weight and area of residence (north).
The third part of the questionnaire included questions about the participants' age, height and weight, gender, place of residence (rural or urban), and speciality.
Birth and referral dates, sex, height, weight, and location of residence data were abstracted from standardized referral forms received from April, 2005 to April, 2009.
The four groups (daily pill, transdermal patch, vaginal ring and other methods) did not differ with regard to age, weight and place of residence (rural vs urban).
