Study of Use of Products and Exposure-Related Behaviors (SUPERB): study design, methods, and demographic characteristics of cohorts.
BACKGROUND
Exposure to toxic chemicals in the home is a growing concern. This report presents an overview of the recruitment, methods for data collection, instruments used to collect data, and participant demographics for a study examining behaviors that influence exposure to environmental toxins in the home environment, also known as SUPERB (Study of Use of Products and Exposure Related Behaviors).


METHODS
The methods involved three different platforms: telephone interviews, internet-based surveys, and home-based monitoring. The purposes of SUPERB were: first, to compare data collection platforms with regard to feasibility, acceptability and reliability; and second, to provide longitudinal population-based data characterizing seasonal and long-term changes in exposure-related behaviors including food consumption, temporal-spatial activity, and household product use.


RESULTS
Two cohorts of households were enrolled: families (one parent and one child) from northern California and older individuals (age 55+) from central California. Parents (n = 499) in Northern California families were on average 36 years of age, 47.1% were Latino or nonwhite, and 10.2% took the survey in Spanish. Most of the children enrolled (n = 566) were under 6 years (82.7%). The older adults enrolled (n = 156) were, on average, 66 years of age and 23.7% were Latino or nonwhite, but only 2.6% completed the survey in Spanish.


CONCLUSIONS
We found that oversampling was successful in improving recruitment of under-represented subgroups, such as those with low education, thereby increasing diversity of our study sample. Protocols that minimize participant time, e.g., use of bar scanners and scales rather than questionnaires regarding use of household products, and the implementation of these protocols by staff who built relationships of trust, resulted in high retention over a longitudinal data collection scheme. A relatively small fraction of those who volunteer for longitudinal internet surveys are consistent in filling them out. Future reports will provide critical information on cross-sectional, seasonal and longitudinal patterns of exposure related behaviors in young children, parents of young children, and older adults.
Hertz-Picciotto
Irva
I
Department of Public Health Sciences, School of Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA. ihp@ucdavis.edu
Cassady
Diana
D
Lee
Kiyoung
K
Bennett
Deborah H
DH
Ritz
Beate
B
Vogt
Raea
R
D000328:Adult; D000368:Aged; D015331:Cohort Studies; D003625:Data Collection / Q000379:methods*; D003710:Demography; D004781:Environmental Exposure / Q000009:adverse effects / Q000032:analysis; D004784:Environmental Monitoring; D005260:Female; D006795:Household Products / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012107:Research Design
J Am Diet Assoc. 1990 Apr;90(4):559-62
2319077
Am J Clin Nutr. 2009 Apr;89(4):1220-6
19225114
J Expo Anal Environ Epidemiol. 2001 May-Jun;11(3):231-52
11477521
Environ Health Perspect. 2003 Jan;111(1):115-22
12515689
Environ Res. 1995 Apr;69(1):15-30
7588491
Environ Res. 2000 Oct;84(2):170-85
11068931
Public Health Nutr. 2001 Dec;4(6):1279-86
11796091
J Expo Anal Environ Epidemiol. 2000 Nov-Dec;10(6 Pt 1):566-78
11140440
Am J Epidemiol. 1985 Jul;122(1):51-65
4014201
Environ Health Perspect. 1998 Feb;106 Suppl 1:387-90
9539035
Vet Hum Toxicol. 1991 Feb;33(1):61-5
2017868
JAMA. 1999 Jun 23-30;281(24):2289-93
10386552
Obes Res. 2001 Jun;9(6):368-79
11399784
Food Chem Toxicol. 2002 Feb-Mar;40(2-3):327-85
11893401
Environ Health Perspect. 2004 Oct;112(14):1386-92
15471730