Tags

Type your tag names separated by a space and hit enter

Characterization and Correction of Bias Due to Nonparticipation and the Degree of Loyalty in Large-Scale Finnish Loyalty Card Data on Grocery Purchases: Cohort Study.
J Med Internet Res. 2020 07 15; 22(7):e18059.JM

Abstract

BACKGROUND

To date, the evaluation of diet has mostly been based on questionnaires and diaries that have their limitations in terms of being time and resource intensive, and a tendency toward social desirability. Loyalty card data obtained in retailing provides timely and objective information on diet-related behaviors. In Finland, the market is highly concentrated, which provides a unique opportunity to investigate diet through grocery purchases.

OBJECTIVE

The aims of this study were as follows: (1) to investigate and quantify the selection bias in large-scale (n=47,066) loyalty card (LoCard) data and correct the bias by developing weighting schemes and (2) to investigate how the degree of loyalty relates to food purchases.

METHODS

Members of a loyalty card program from a large retailer in Finland were contacted via email and invited to take part in the study, which involved consenting to the release of their grocery purchase data for research purposes. Participants' sociodemographic background was obtained through a web-based questionnaire and was compared to that of the general Finnish adult population obtained via Statistics Finland. To match the distributions of sociodemographic variables, poststratification weights were constructed by using the raking method. The degree of loyalty was self-estimated on a 5-point rating scale.

RESULTS

On comparing our study sample with the general Finnish adult population, in our sample, there were more women (65.25%, 30,696/47,045 vs 51.12%, 2,273,139/4,446,869), individuals with higher education (56.91%, 20,684/36,348 vs 32.21%, 1,432,276/4,446,869), and employed individuals (60.53%, 22,086/36,487 vs 52.35%, 2,327,730/4,446,869). Additionally, in our sample, there was underrepresentation of individuals aged under 30 years (14.44%, 6,791/47,045 vs 18.04%, 802,295/4,446,869) and over 70 years (7.94%, 3,735/47,045 vs 18.20%, 809,317/4,446,869), as well as retired individuals (23.51%, 8,578/36,487 vs 31.82%, 1,414,785/4,446,869). Food purchases differed by the degree of loyalty, with higher shares of vegetable, red meat & processed meat, and fat spread purchases in the higher loyalty groups.

CONCLUSIONS

Individuals who consented to the use of their loyalty card data for research purposes tended to diverge from the general Finnish adult population. However, the high volume of data enabled the inclusion of sociodemographically diverse subgroups and successful correction of the differences found in the distributions of sociodemographic variables. In addition, it seems that food purchases differ according to the degree of loyalty, which should be taken into account when researching loyalty card data. Despite the limitations, loyalty card data provide a cost-effective approach to reach large groups of people, including hard-to-reach population subgroups.

Authors+Show Affiliations

Faculty of Social Sciences (Health Sciences), Tampere University, Tampere, Finland. VTT Technical Research Centre of Finland Ltd, Tampere, Finland.Department of Food and Nutrition, University of Helsinki, Helsinki, Finland.Department of Food and Nutrition, University of Helsinki, Helsinki, Finland.Department of Food and Nutrition, University of Helsinki, Helsinki, Finland.Faculty of Management and Business, Tampere University, Tampere, Finland.Department of Food and Nutrition, University of Helsinki, Helsinki, Finland.Tampere University Library, Tampere University, Tampere, Finland.Faculty of Social Sciences (Health Sciences), Tampere University, Tampere, Finland.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

32459633

Citation

Vuorinen, Anna-Leena, et al. "Characterization and Correction of Bias Due to Nonparticipation and the Degree of Loyalty in Large-Scale Finnish Loyalty Card Data On Grocery Purchases: Cohort Study." Journal of Medical Internet Research, vol. 22, no. 7, 2020, pp. e18059.
Vuorinen AL, Erkkola M, Fogelholm M, et al. Characterization and Correction of Bias Due to Nonparticipation and the Degree of Loyalty in Large-Scale Finnish Loyalty Card Data on Grocery Purchases: Cohort Study. J Med Internet Res. 2020;22(7):e18059.
Vuorinen, A. L., Erkkola, M., Fogelholm, M., Kinnunen, S., Saarijärvi, H., Uusitalo, L., Näppilä, T., & Nevalainen, J. (2020). Characterization and Correction of Bias Due to Nonparticipation and the Degree of Loyalty in Large-Scale Finnish Loyalty Card Data on Grocery Purchases: Cohort Study. Journal of Medical Internet Research, 22(7), e18059. https://doi.org/10.2196/18059
Vuorinen AL, et al. Characterization and Correction of Bias Due to Nonparticipation and the Degree of Loyalty in Large-Scale Finnish Loyalty Card Data On Grocery Purchases: Cohort Study. J Med Internet Res. 2020 07 15;22(7):e18059. PubMed PMID: 32459633.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characterization and Correction of Bias Due to Nonparticipation and the Degree of Loyalty in Large-Scale Finnish Loyalty Card Data on Grocery Purchases: Cohort Study. AU - Vuorinen,Anna-Leena, AU - Erkkola,Maijaliisa, AU - Fogelholm,Mikael, AU - Kinnunen,Satu, AU - Saarijärvi,Hannu, AU - Uusitalo,Liisa, AU - Näppilä,Turkka, AU - Nevalainen,Jaakko, Y1 - 2020/07/15/ PY - 2020/01/31/received PY - 2020/05/14/accepted PY - 2020/04/18/revised PY - 2020/5/28/pubmed PY - 2021/1/7/medline PY - 2020/5/28/entrez KW - diet KW - food KW - loyalty card data KW - raking KW - selection bias KW - weighting SP - e18059 EP - e18059 JF - Journal of medical Internet research JO - J Med Internet Res VL - 22 IS - 7 N2 - BACKGROUND: To date, the evaluation of diet has mostly been based on questionnaires and diaries that have their limitations in terms of being time and resource intensive, and a tendency toward social desirability. Loyalty card data obtained in retailing provides timely and objective information on diet-related behaviors. In Finland, the market is highly concentrated, which provides a unique opportunity to investigate diet through grocery purchases. OBJECTIVE: The aims of this study were as follows: (1) to investigate and quantify the selection bias in large-scale (n=47,066) loyalty card (LoCard) data and correct the bias by developing weighting schemes and (2) to investigate how the degree of loyalty relates to food purchases. METHODS: Members of a loyalty card program from a large retailer in Finland were contacted via email and invited to take part in the study, which involved consenting to the release of their grocery purchase data for research purposes. Participants' sociodemographic background was obtained through a web-based questionnaire and was compared to that of the general Finnish adult population obtained via Statistics Finland. To match the distributions of sociodemographic variables, poststratification weights were constructed by using the raking method. The degree of loyalty was self-estimated on a 5-point rating scale. RESULTS: On comparing our study sample with the general Finnish adult population, in our sample, there were more women (65.25%, 30,696/47,045 vs 51.12%, 2,273,139/4,446,869), individuals with higher education (56.91%, 20,684/36,348 vs 32.21%, 1,432,276/4,446,869), and employed individuals (60.53%, 22,086/36,487 vs 52.35%, 2,327,730/4,446,869). Additionally, in our sample, there was underrepresentation of individuals aged under 30 years (14.44%, 6,791/47,045 vs 18.04%, 802,295/4,446,869) and over 70 years (7.94%, 3,735/47,045 vs 18.20%, 809,317/4,446,869), as well as retired individuals (23.51%, 8,578/36,487 vs 31.82%, 1,414,785/4,446,869). Food purchases differed by the degree of loyalty, with higher shares of vegetable, red meat & processed meat, and fat spread purchases in the higher loyalty groups. CONCLUSIONS: Individuals who consented to the use of their loyalty card data for research purposes tended to diverge from the general Finnish adult population. However, the high volume of data enabled the inclusion of sociodemographically diverse subgroups and successful correction of the differences found in the distributions of sociodemographic variables. In addition, it seems that food purchases differ according to the degree of loyalty, which should be taken into account when researching loyalty card data. Despite the limitations, loyalty card data provide a cost-effective approach to reach large groups of people, including hard-to-reach population subgroups. SN - 1438-8871 UR - https://www.unboundmedicine.com/medline/citation/32459633/Characterization_and_Correction_of_Bias_Due_to_Nonparticipation_and_the_Degree_of_Loyalty_in_Large_Scale_Finnish_Loyalty_Card_Data_on_Grocery_Purchases:_Cohort_Study_ L2 - https://www.jmir.org/2020/7/e18059/ DB - PRIME DP - Unbound Medicine ER -