The Farage Quality of Life measure for consumer products: Development and initial implementation

Despite the existence of numerous health-related quality of life (HRQoL) measures, few if any are geared to evaluating the impact of consumer products. We describe the development and initial implementation of the Farage Quality of Life (FQoL™) general questionnaire, a self-administered questionnaire to assess the potential impact of a variety of consumer products on overall well-being and HRQoL. We developed the 27-item FQoL™ measure, scored on a Likert scale and covering Overall Quality of Life (1 item), Well-Being (12 items), and Energy and Vitality (14 items), and a 3-item Menstrual Module for use with menstruating women. We assessed test-retest reliability by administering the items twice to a sample of 20 women 3 days apart, calculating mean absolute differences in responses. Then, in a study of 119 women ages 18-55 years who were randomly assigned to use a new brand of menstrual pad vs. their usual menstrual pads for 1 menstrual period, we administered the FQoL™ questionnaire 5-7 days before their menstrual period and 5-7 days after the start of their period. We compared changes in responses within groups and between groups pre- vs. during menstruation. Overall, test-retest reliability was good, with a mean (SD) absolute difference for the 27 general items of 0.51 (0.31). In the menstrual pad study, the mean (SD) age of responders was 35.3 (7.9) years; 59 (50%) were age 18-35 and 60 (50%) were age 36-55. Relative to the intervention group, the usual pads group reported worse HRQoL during vs. pre-menstruation on items addressing self-confidence, managing stress, energy, and fatigue (P ≤ 0.05 for each comparison). In subgroup analyses, relative to intervention patients, women age 18-35 in the usual pads group reported greater changes for the worse during vs. pre-menstruation in managing stress; energy; and fatigue, but relatively better work or school attendance during vs. pre-menstruation, and women age 36-55 in the usual pads group reported greater changes for the worse in self-confidence and in desire to go out in public (P ≤ 0.03 for each comparison). The general FQoL™ is a new measure of HRQoL applicable to consumer product evaluation. It has good test-retest reliability. The FQoL™ menstrual module detects changes in HRQoL during vs. before the menstrual period associated with menstrual pad use. Further research is needed to assess the construct validity of the HRQoL.