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. 2021 Sep 20;30(12):2227–2234. doi: 10.1158/1055-9965.EPI-21-0585

Figure 1.

Figure 1. Concepts of generalizability and transportability. Diagrams illustrating generalizability (A) and transportability (the target population may or may not include any RCT-eligible individuals; B). C, In our example using the NLST, generalizability applies when we consider participants from 23 centers with females ≥40% as the trial sample and those from the entire NLST as the target population (i.e., the study participant population is a subset of the target population). D, Transportability applies when we consider participants from 23 centers with females ≥40% as the trial sample and those from the other 10 centers with females <40% as the target population (i.e., the study participant population is external to the target population).

Concepts of generalizability and transportability. Diagrams illustrating generalizability (A) and transportability (the target population may or may not include any RCT-eligible individuals; B). C, In our example using the NLST, generalizability applies when we consider participants from 23 centers with females ≥40% as the trial sample and those from the entire NLST as the target population (i.e., the study participant population is a subset of the target population). D, Transportability applies when we consider participants from 23 centers with females ≥40% as the trial sample and those from the other 10 centers with females <40% as the target population (i.e., the study participant population is external to the target population).