Epidemiological studies suggest that tea drinking may reduce the risk of @entity65 and @entity5 . Although tea is an important source of antioxidant phytochemicals, variation in preparation techniques may translate to variation in antioxidant capacity. However, most large-scale epidemiological studies use regular food frequency questionnaires to estimate tea intake, and nationally available nutrient analysis databases do not include levels of black tea @entity6398 . The Arizona Tea Questionnaire (ATQ) was designed as a tool for collecting more complete dietary tea consumption information, and a database was developed after analyzing 40 black tea samples (brewed, instant, and sun tea) for @entity6398 . This study assesses the reliability and relative validity of the ATQ and @entity3978 database. Relative validity of estimates of black tea consumption was tested by comparing the ATQ with the traditional Arizona Food Frequency Questionnaire and four days of food records. The ATQ was tested for reproducibility of estimates of black (hot and iced) tea consumption and levels of black tea @entity3978 intake. Correlations between two measures of intake taken 2 months apart ranged from 0.72 for black hot tea to 0.86 for black sun tea. Mean intakes (range) of total @entity3088 for black tea consumers were 80.8 (3.0-588.0) mg/day at the first ATQ and 102.4 (4.5-802.3) mg/day at the second ATQ (r = 0.83, P < 0.001). The ATQ provided highly reproducible estimates of both @entity1907 and individual tea @entity3978 intake. This instrument may be a useful tool in studies of the associations between tea consumption, tea @entity6398 intake, and risk for @entity102 .

Reproducibility and relative validity of a questionnaire to assess intake of black tea XXXX in epidemiological studies.

@entity3978 :: ('CHEBI:26195', 'Chemical') :: ['polyphenol'] @entity5 :: ('MESH:D009369', 'Disease') :: ['cancers'] @entity102 :: ('MESH:D002908', 'Disease') :: ['chronic disease'] @entity3088 :: ('MESH:D005419', 'Chemical') :: ['flavonoids'] @entity6398 :: ('MESH:D059808', 'Chemical') :: ['polyphenols'] @entity65 :: ('MESH:D002318', 'Disease') :: ['cardiovascular diseases'] @entity1907 :: ('MESH:D014397', 'Disease') :: ['total tea consumption']
@entity6398 :: (MESH:D059808,Chemical) :: ['polyphenols']
