According to Chou et al. (2013), the effectiveness of pressure ulcer prevention interventions is mostly consistent with system reviews, which have established that more static surfaces reduce the risk of a patient developing pressure ulcers. This is in comparison to normal mattresses used in hospitals. However, there is insufficient evidence on the relative effectiveness of dynamic surfaces and other preventative interventions that can be used to reduce acquired pressure injuries. For example, one quality study demonstrated that pressure ulcer assessment tools reduce patients' risk of developing pressure ulcers compared to less consistent risk assessments based on nurses' clinical decisions. The results of another review differ from the investigation conducted by Chou et al. (2013) because they included patients who had suffered from pre-existing higher-stage ulcers. The data collected for the analysis was difficult to interpret because patients at greater risk of developing pressure ulcers may have undergone more intensive interventions. Furthermore, the results show that the accuracy of the tools used to assess the degree of risk depends on subsequent active interventions. In any case, the risk of developing bedsores in a hospital setting can be reduced through the use of beds with static support surfaces. The study by Swafford, Culpepper, and Dunn (2016) found that bed sores were reduced by