Table 2: Epidemiological questionnaire.

Item Cases
(Total 250)
Controls
(Total 250)
P value
Stats: Hypothesis
test
No. % No. %
Family Income Insufficient 215 86% 25 10% 0.009
Sufficient 35 14% 225 90% 0.009
Father's Education Illiterate 18 7.2% 5 2% 0.008
High or Middle School 230 92% 15 6% 0.0095
University 2 0.8% 230 92% 0.0095
Mother's Education Illiterate 48 19.2 34 13.6% 0.008
High or Middle School 200 80% 16 6.4% 0.009
University 2 0.8% 200 80% <0.007
Father's Occupation Manual Worker 192 76.8% 10 4% 0.0095
Employee 56 22.4% 10 4% 0.009
Professional 2 0.8% 230 92% 0.0095
Mother's Occupation House-wife 225 90% 40 16% 0.0095
Employee 23 9.2% 20 8% 0.008
Professional 2 0.8% 190 76% 0.0095
Geographic Region Slum 162 64.8% 10 4% 0.095
Rural 50 20% 15 6% 0.0095
Urban 38 15.2% 225 90% 0.009
Housing Conditions Poorly Built – Low Stories 188 75.2% 225 90% 0.008
Well Built – Middle or Upper Stories 62 24.8% 25 10% 0.0095
Exposure to Sun Less than ½ h 150 60% 25 10% 0.0095
½h or more 100 40% 225 90% 0.0095
Clothing Completely Wrapped 200 80% 25 10% 0.009
Partially Wrapped 50 20% 225 90% 0.0095