We used the "disablement process" of Verbrugge [ 23] as a framework for studying determinants and outcomes in the present study.
The main determinants of survival in the present study - birth weight, gender, being born before arrival in the hospital, resuscitation at birth, NEC, hypotension and NCPAP are not surprising and very similar to other reports on VLBW outcome [ 5- 7, 9- 22].
While a number of causes of dyspnoea have been identified, including age, poor physical fitness, muscle atrophy and social and environmental factors, we could not identify the primary determinants of dyspnoea in the present study.
Characteristics that had never been previously evaluated or described, at least in Brazilian studies, behaved as determinants of EBF in the present study, and thus allow to expand the existing list of factors determining this practice.
A determinant analysis was performed in 2012 (see Background), resulting in a set of determinants that the present study will anticipate (see Activity 1).
Village was one of the strongest determinants of AF-alb in the present study together with the time of sampling.
Given that the potential determinants of DDT and DDE included in the present study were largely self-reported, it is possible that there is some information bias.
Preferences towards emigration among students might change once they enter the labour market, as the probability of not obtaining a specialty training position in Poland is not high and would not have been a major determinant of migration preference in the present study.
The two most important determinants of physical activity variability in the present study were gender and FEV1% predicted.
