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Table 1 Characteristics of the study participants

From: Participants’ understanding of a randomized controlled trial (RCT) through informed consent procedures in the RCT for breast cancer screening, J-START

   N %
Education level Junior high school 3 0.8
High school 96 25.5
Junior college* 154 41.0
University, graduate school 105 27.9
No reply 18 4.8
Marital status Married, living with a partner 280 74.5
Unmarried, widow, divorced 78 20.7
No reply 18 4.8
Work status Employed 308 81.9
Unemployed 49 13.0
No reply 19 5.1
Study allocation** Intervention group 198 52.7
Control group 162 43.1
No reply 16 4.3
  1. The mean age of the participants was 43.8 years (SD = 3.1). *Junior college includes vocational school and technical college. **Participants were randomly assigned to the intervention group (screening by mammography and ultrasound) or control group (screening only by mammography) in the Japan STrategic Anti-cancer Randomized controlled Trial (J-START).