Our analysis was based on a population-based sample of schoolchildren in the 4th to 6th year of primary schools (9 12 years old) across Sabadell, Spain, in 2006 (Font-Ribera et al. 2009).
Methods: We conducted a cross-sectional study of a population-based sample of 3,178 schoolchildren (9 12 years old) in Sabadell, Spain, in 2006.
estimates based on a representative sample of schoolchildren with Japanese estimates based on an upper-income, heavily urban sample.
The sample of schoolchildren was selected in 2011, through a sampling process involving two random stages.
In study 1, a sample of schoolchildren (n = 62; M = 12.48 years; SD = 1.72) took part in a cold-pressor task.
Each study year, the new questions added to the questionnaire were pretested in a sample of schoolchildren.
A cross-sectional study was conducted in a randomly selected sample of schoolchildren in Doha, Qatar, from February to June 2005.
To obtain a sample of schoolchildren of mixed socio-economic background, schools were selected at random from urban and rural areas in Kinondoni and Temeke districts.
However, the sample of schoolchildren allowed for various degrees of dental problems on the DMFT, including children free of dental problems.
Although the sample of schoolchildren came from varying academic abilities, socioeconomic background and the gender balance was acceptable, this study was conducted in an urban area.
Methods: This study was based on a sample of 2,111 schoolchildren (7 10 years of age) from 36 schools in Barcelona in 2012.
