In prospective study using Specific Quality of Life & Outcomes Response-Venous (SQOR-V) questionnaire the recall bias had the same magnitude as the minimally important difference

Objective To assess whether the measurement error, and recall bias can reach magnitudes comparable to minimally important difference (MID) in symptoms scores used in chronic venous disease-specific quality of life QOL instruments, such as Specific Quality of Life & Outcomes Response-Venous (SQOR-V) questionnaire.