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Table 1 Rates of participation at baseline and at follow-up of nine different schools in the city of São Paulo, Brazil (2014–2016)

From: A school-based epidemiological field survey: difficulties in collecting psychiatric outcome data in a middle-income country

Schoola Baseline Re-Interviewed at follow-up Refusal at follow-up Not contacted at follow-up after at least five attempts
  N % n % n % n %
Neighborhood with high exposure to urban violence and low HDIb
 001 18 18.0 9 50.0 - - 9 50.0
 008 47 47.0 40 85.1 7 14.9 - -
 002 20 20.0 10 50.0 3 15.0 7 35.0
 003 15 15.0 - - - - 15 100.0
 Sub-Total 100 100 59 59.0 10 10.0 31 31.0
Neighborhood with low exposure to urban violence and high HDIb
 004 14 17.5 6 42.8 8 57.2 - -
 005 13 16.2 9 69.2 4 30.8 - -
 000 7 8.75 5 71.4 - - 2 28.6
 009 29 36.2 7 24.1 14 48.2 8 27.7
 006 17 21.1 5 29.6 6 35.2 6 35.2
 Sub-Total 80 100.0 32 40.0 32 40.0 16 20.0
 TOTAL 180 100.0 91 50.5 42 23.3 47 26.2
  1. aSchools were numbered in order to guarantee anonymity; bHuman Development Index