Considering parliamentary buildings of authoritarian regimes such as the Parliament in Bucharest, which was to become the largest administrative building in the world, one could conclude that a low democracy index is an indication of the size of parliamentary buildings. Trying to relate the size of the parliament and the volume of the building with the democracy index of the respective country, however, no clear correlation can be found. This may also be due to the fact that comparatively small countries with authoritarian regimes, especially in Africa, are in the lower third of the democracy index ratings. It should be noted that the four largest parliament buildings are in North Korea, Myanmar, China and Romania. On the other hand, the graph comparing all the parliaments studied in terms of the proportion of women in parliament and the democracy index, shows a tendency that is not surprising. The more women are represented in a parliament, the higher the democracy index was found. Historical events such as the end of World War II or the collapse of the USSR can be read in the time graph showing the years of construction of the parliaments. 

The analysis of the collected data shows that the French type is the most common type of plenary halls in comparison to all national parliament buildings of the 193 UN member states. 

If the Democracy Index, established by the magazine, “The Economist,” is put into context with the layout of the plenary hall, it becomes clear that the classroom type is used in the least democratic countries. The type showing the highest average of democracy index is the British type with opposite rows of benches. The circular type scores comparatively poorly. However, this hall layout is represented only ten times in the compared parliament buildings. Among them, Jordan, Sudan and Uzbekistan with below-average low democracy indexes.