Reporting of dental status from full-arch radiographs: Descriptive analysis and methodological aspects

Figure 3 Shares of patients in the 37 evaluated studies with respect to the country of origin: The number of contributing studies is noted in brackets behind the country. Preponderance of United States is due to two reports of “mass X-ray evaluation” in the years 1977 and 1982. If these two are left out of consideration the median value of studied subjects in a paper is 212 (mean = 485).