Mediators of fruit and vegetable consumption among colorectal cancer survivors.
BACKGROUND
Due to early detection and treatment, survival from colorectal cancer (CRC) diagnosis has been steadily increasing. A CRC diagnosis could be considered a "teachable moment," a time when interventionists might successfully promote dietary changes. CRC interventions with tailored print communication (TPC) and telephone motivational interviewing (TMI) have been shown to be effective in promoting fruit and vegetable consumption (FVC) among CRC survivors. However, little is known about how these interventions work to exert their effect. This study investigated whether information processes mediate the relationship between a CRC intervention and FVC among CRC survivors.


METHODS
This research used data from NC STRIDES, a study that tested the efficacy of two CRC intervention strategies to promote FVC among CRC survivors. Participants were randomized to control, TPC, TMI, or combined (TPC+TMI). Structural equation models were constructed to analyze data from 266 CRC survivors using two different measures of FVC, a 35-item and a 2-item measure.


RESULTS
Two information processes, relevance of communication and trust in the communication, mediated the effect of TPC+TMI on FVC for both 35-item and 2-item measures. TPC+TMI was significantly associated with relevance of communication, and perceiving greater relevance was significantly related to trust in the communication. Trust was significantly related to FVC.


CONCLUSIONS
Information processes, including relevance and trust in the communication, serve as mediators of the relationship between the CRC intervention and FVC.


CONCLUSIONS
Future intervention research should investigate ways to enhance relevance of communication and trust in interventions with CRC survivors.
Ko
Linda K
LK
University of North Carolina, Chapel Hill, NC 27599, USA. lindako@email.unc.edu
Campbell
Marci K
MK
Lewis
Megan A
MA
Earp
Joanne
J
Devellis
Brenda
B
D000230:Adenocarcinoma / Q000523:psychology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D015179:Colorectal Neoplasms / Q000523:psychology*; D004032:Diet; D005260:Female; D005638:Fruit; D006266:Health Education / Q000379:methods; D006293:Health Promotion / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D009042:Motivation; D011379:Prognosis; D015996:Survival Rate; D017741:Survivors / Q000523:psychology*; D014675:Vegetables