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

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

School^a	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 HDI^b
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 HDI^b
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

^aSchools were numbered in order to guarantee anonymity; ^bHuman Development Index

ISSN: 1471-244X