Data collection was performed from January to May 2011,
and the
analyses took place before,
during and after a sharp fluctuation in ethanol prices — owing to macroeconomic factors such as the international price of sugar (Brazilian ethanol is made from sugarcane)-- leading consumers to switch motor fuels in São Paulo City.
Despite inclusion in
data collection, little self - reported information was provided by parents (
and verified by contact with the research team) at follow - up on the use of health, social service, educational psychology or criminal justice service contacts
during the course of the trial, attributable to these events or to involvement in the FLNP, with insufficient
data to undertake any meaningful
analysis.