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Table 1 Characteristics of the study sample (n = 1,327)

From: Subclinical thyroid disorders and cognitive performance among adolescents in the United States

Characteristics n %
Sex:   
Boys 610 46.0
Girls 717 54.0
Ethnicity/race:   
White 346 26.1
African American 458 34.5
Mexican American 449 33.8
Other 74 5.6
Poverty Income Index:   
Not known 106 8.0
<1 429 32.3
1–2 354 26.7
>2 438 33.0
Test language:   
Spanish 52 3.9
English 1275 96.1
Age (in years):   
13 321 24.2
14 347 26.1
15 320 24.1
16 339 25.5