The territorial subdivision below the level of the union republic — or at least below the level of the larger union republics — is that of the oblast, the krai, or the autonomous republic. In 1977 there were 120 oblasts, 6 krais, and 20 autonomous republics, and they corresponded roughly to the American state in size.
It is important to note, however, that the general pattern of Nizhnii Novgorod oblast at the top and Tiumen' and Yaroslavl' oblasts in the middle, with Saratov at the bottom, occurred too often across all indicators to assume that even those differences in means that were not significant at a .05 confidence level or better occurred merely by chance.