Psychometric testing of four transtheoretical model questionnaires for the behavior, completing health care proxies

Abstract

The purpose of the study was to develop four questionnaires based on the transtheoretical model (TTM) to assess the behavior, completing a healthcare proxy (HCP). The aims were to (a) operationalize the four TTM constructs for completing a HCP and (b) evaluate the psychometric properties of the questionnaires. The questionnaires were constructed and content validity established using an expert panel. Internal consistency values for each questionnaire and subscales within each questionnaire were >.79. Confirmatory factor analysis provided evidence that decisional balance and the processes of change questionnaires each contained two factors. Our data support validity and reliability of the TTM questionnaires related to HCP completion.

The Transtheoretical Model in Weight Management: Validation of the Processes of Change Questionnaire

“…This model has also been shown to be valid in other fields, such as alcohol misuse [20,21] and exercise [22,23]. However, alternative models involving fewer processes have been found to be the most comprehensive in other fields [24][25][26]. In this regard, Horwath [27] and Povey et al [28] have both questioned whether the processes of change originally defined by the TTM in the context of addictions would also be applicable to the field of weight management.…”

Promoting advance care planning as health behavior change: Development of scales to assess Decisional Balance, Medical and Religious Beliefs, and Processes of Change

“…(51, 52) The former study demonstrated high internal reliability for the scales, but it did not examine their validity. (51) The latter focused on decisional balance alone, demonstrating lower internal consistency, but high construct validity. (52)…”

The balancing point: understanding uptake of advance directive forms in a rural Australian community

“…Our allocation of participants to a stage in the transtheoretical model was based on open-ended responses to interview questions, rather than using recently validated instruments,51 52 or probing for specific dates to ‘quantify’ intentions to engage in ACP. This methodology also left us unable to quantify an individual's level of personal empowerment.…”

“…Our proposed model has generated quantifiable hypotheses, and future research may employ recently validated instruments51 52 to examine how perceived susceptibility, empowerment and the balance between these constructs influence stage of readiness to engage in AD form completion. We predict that perceived susceptibility may be associated with transition from the precontemplation to contemplation stage of readiness, while empowerment may be associated with transition through the later stages of the model.…”