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. 2012 Jul 2;7(7):e39403. doi: 10.1371/journal.pone.0039403

Figure 1. Histogram of the number of CTs performed per individual.

Figure 1

Over 70% of participants had at least one follow-up CT. A total of 345 had 1 CT, 183 had 2 CTs and 654 had 3 or more CTs. Those that did not have follow-ups were individuals with no nodules on initial CT who chose not to return or individuals who were not yet due for follow-up by the end of the study period.