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Table 1 Characteristics of samples in the national Brazilian Surveillance System of Protective and Risk Factors for Chronic Diseases Telephone Survey (VIGITEL), 2006-2012

From: Time trends of physical activity and television viewing time in Brazil: 2006-2012

Indicators 2006 2007 2008 2009 2010 2011 2012
Interviewed 54,369 54,251 54,353 54,367 54,339 54,144 45,448
Females (%) 53.9 53.9 53.9 53.9 53.9 53.9 53.9
Mean age (SD) 40.1 (16.2) 40.3 (16.2) 40.5 (16.2) 40.8 (16.1) 40.9 (16.3) 41.1 (16.3) 41.3 (16.4)
0-4 years of schooling (%) 21.6 20.4 19.4 18.0 16.8 17.2 16.1
Response rate (%) 90.9 92.3 94.2 97.0 97.7 97.8 94.1