Table 3. Associations between potential exposure, personal, and demographic variables in the 2005–2006 NHANES data and urinary BPA.

Association to be tested	Variable ID	Na	P-value [+/−]
BMI (kg/m2)	BMXBMI	2530	0.43
Age (in months)	RIDAGEMN	2509	<0.00001 [−]
Genderb	RIAGENDR	2548	0.0002
Tuna consumption (number of times per day, week, month, or year)	FFQ0073	1700	0.17
Soda consumption (number of times per day, week, or month)c
Non-summer months	FFQ0009B	1621	0.0001 [+]
Summer months	FFQ0009A	1622	0.0004 [+]
Total bottled water drank yesterday (g) (two successive interview days)	DR1BWATZ	2434	0.32
	DR2BWATZ	2217	0.012 [−]
School lunches (number per week during school year)	DBD381	857	0.002 [+]
Meals not prepared at home (number of times per week)	DBD091	2524	0.006 [+]
Tobacco use
Current smoker? (Every day, some days, not at all)d	SMQ040	690	0.011 [−]
# cigarettes per day over last 5 days?e	SMQ720	391	0.063
# cigarettes per dayd	SMD070	279	0.20
Alcohol consumption (number drinks per week, month, or year)d	ALQ120Q	1207	0.15
Annual household income	INDHHINC	2410	0.001
Race/ethnicityf	RIDRETH1	2523	<0.00001

Abbreviations: BMI, body mass index; BPA, bisphenol A

Bold indicates statistically significant associations; for associations with P<0.05, [+/−] denotes a positive or negative correlation.

^a# participants with both urinary BPA data and questionnaire data.

^bWilcoxon test (male>female).

^cNo information was given on whether the soda was canned or bottles; it is likely that the responses represent a mixture of bottled and canned soda consumption.

^dAges 20+ years.

^eIncludes only those individuals who reported smoking at least one cigarette over the last 5 days.

^fMexican Americans and Non-Hispanic Whites significantly lower than Non-Hispanic Blacks.