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. 2017 Mar 9;16:23. doi: 10.1186/s12940-017-0224-6

Table 1.

Descriptive statistics describing the study population

Variables N %Male %Female
Child gender 92 64% 36%
%No %Yes
Mother employed 86 34% 66%
Father employed 60 12% 88%
N M SD Min Max
Child age in years 88 4.31 0.68 3.12 5.75
Family context
 Mother’s Education in years 86 16.30 3.67 10 34
 Father’s Education in years 64 16.08 3.02 10 24
 Household incomea 86 5.22 2.84 1 8
 Home learning environmentb 88 0.01 1.00 −2.80 1.82
Adverse experiences 90 0.40 0.81 0 4
Flame retardants
 PBDE 72 3.54 1.15 0.42 5.96
 OPFR 72 5.58 0.79 4.25 7.87
Teacher-rated social behavior
 Communication 89 1.94 0.50 0.29 3.00
 Cooperation 89 1.96 0.61 0.67 3.00
 Assertion 89 1.65 0.52 0.14 2.86
 Responsibility 89 1.95 0.51 0.75 3.00
 Empathy 89 1.93 0.58 0.50 3.00
 Engagement 89 1.90 0.53 0.57 3.00
 Self-control 89 1.73 0.61 0.14 3.00
 Externalizing aggregate 89 0.76 0.48 0.00 2.06
 Internalizing 89 0.61 0.47 0.00 1.86

aHousehold income is measured on a scale from 1 to 8

bHome learning environment is an aggregate of standardized items