The overall finding was that there was no significant influence of LEED certification on occupant satisfaction in consideration of the overall building and workspace ratings. The paper noted that the data may not be representative of the entire building stock and a randomized approach was not used in the data assessment. Based on similar dataset (21,477 occupants) in 2013, Schiavon and Altomonte found that occupants have equivalent satisfaction levels in LEED and non-LEED buildings when evaluated independently from the following factors: office type, spatial layout, distance from windows, building size, gender, age, type of work, time at workspace, and weekly working hours. LEED certified buildings may provide higher satisfaction in open spaces than in enclosed offices, in smaller buildings than in larger buildings, and to occupants having spent less than one year in their workspaces rather than to those who have used their workspace longer. The study also notes that the positive value of LEED certification from the aspect of occupant satisfaction may tend to decrease with time. In 2015, a study on indoor environmental quality and the potential health benefits of green-certified buildings was developed by environmental health scientist Joseph Allen (et al.) showing that green buildings provide better indoor environmental quality with direct benefits to human health of occupants of those buildings in comparison to non-green buildings. One of the limitations of the study was the use of subjective health performance indicators since there is a lack of definition on such indicators by current studies. Newsham et al. published a detailed study on IEQ and LEED buildings in August 2013. Field studies and post-occupancy evaluations (POE) were performed in 12 green and 12 conventional buildings across Canada and the northern United States. On-site, 974 workstations were measured for thermal conditions, air quality, acoustics, lighting, workstation size, ceiling height, window access and shading, and surface finishes. Responses were positive in the areas of environmental satisfaction, satisfaction with thermal conditions, satisfaction with outside views, aesthetic appearance, reduced disturbance from HVAC noise, workplace image, night-time sleep quality, mood, physical symptoms, and reduced number of airborne particulates. The results showed green buildings exhibited superior performance compared with similar conventional buildings. A 2017 study by Altomonte, Schiavon, et al. investigated whether a green rating itself leads to higher occupant satisfaction with IEQ. Based on the analysis of a subset of the CBE Occupant IEQ including 11,243 responses from 93 LEED-certified office buildings, this