Table 1.

General characteristics of the cohorts

Cohort	No. Participants	No. Cases	Study period	No. years of follow-up (mean [SD])	Age at baseline (mean [SD])	Male (%)	BMI ≥30 (%)
NIH-AARP Diet and Health Study18	498,957	583	1995–2006	9.1 (2.9)	62.0 (5.4)	61	22
US Radiologic Technologists Study19	89,529	275	1983–2006	15.9 (5.3)	40.4 (11.1)	23	9
Prostate, Lung, Colorectal, and Ovarian Screening Study20	139,131	168	1993–2009	9.6 (3.2)	62.6 (5.3)	50	24
Agricultural Health Study21	67,925	67	1993–2005	9.9 (1.9)	46.9 (12.6)	58	21
Breast Cancer Detection Demonstration Project22	53,390	63	1979–1999	15.3 (2.8)	55.4 (8.8)	0	10
Total	848,932	1,156	1979–2009	10.3 (4.0)	58.2 (10.4)	51	20