“…HRQOL is an important issue in caring for the elderly [19,20], acute and chronic disease patients [21,22]. The associations between HRQOL and health service utilization have been reported in chronic disease patients [23,24], aging patients with osteoarthritis [25] and primary care patients [13], and healthy individuals [26]. As an underprivileged population group in China, migrant workers suffer a variety of inequalities including long working hours, insecure employment, overcrowded and insalubrious living conditions [6,27].…”