Validation of a single question to measure internal health locus of control in Swedish primary care

Abstract

Background: Behavioral risk factors are highlighted in the prevention of diabetes and cardiovascular disease. Screening for health locus of control could be a feasible way to better identify individuals who could benefit from preventive behavioral change interventions. The aim of the study was to investigate the correlation between a single question measuring internal health locus of control (IHLC) and the Multidimensional Health Locus of Control Scale (MHLC) and to assess how IHLC relates to the General Self-Efficacy scale (GSE) in a primary care setting.

Methods: Primary care patients, aged 18 and older, attending three primary care centers in southwest Sweden were consecutively asked to anonymously participate in the study. The patients were given a questionnaire and instructed to return the questionnaire in a sealed box in the waiting room.

Results: In all, 519 patients were included. The correlation between MHLC Internality and IHLC was weak (r = 0.21, p < 0.001). An increase of one point on the internality scale of the MHLC gave an odds ratio of 1.19 (95% CI 1.11-1.28) for reporting high IHLC, and thus a five-point increase gave a doubled likelihood, OR = 2.40, CI 1.67-3.46. The results for the other scales of the MHLC and GSE were similar.

Conclusion: In this study, we found weak but statistically significant support for the single-question IHLC as a measure of internal health locus of control. Given that the correlation was weak, we recommend using the MHLC when possible.

Keywords: Methods; health behavior; locus of control; prevention; validation studies.