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Table 3 Results from multivariable linear regression analysis for the relationship between trial characteristics and enrollment rate of BIPOC groups

From: Twenty-year trends in racial and ethnic enrollment in large diabetes randomized controlled trials

Trial factors Estimated β (95%CI) P
Year of publication
 2000–2009 Ref -
 2010–2020 5.03 (0.31, 9.75) 0.037
Sample size ≥ 716a  − 1.82 (− 5.17, 1.54) 0.287
Diabetes type
 Other Ref -
 Type 2 diabetes 2.59 (0.17, 5.01) 0.036
Enrollment location
 Other Ref -
 Ambulatory  − 5.60 (− 11.06, − 0.14 0.044
Random type
 Cluster Ref -
 Individual  − 4.06 (− 18.11, 9.98) 0.570
Trial primary objective
 Complication Ref -
 Glucose control 3.07 (− 2.06, 8.20) 0.240
 Management/ Mixed  − 1.78 (− 6.39, 2.83) 0.449
Intervention
 Type of intervention
  Others Ref -
  Medication  − 4.48 (− 10.41, 1.44) 0.138
 Frequency of intervention
  Others Ref -
  Weekly/daily  − 1.73 (− 6.49, 3.03) 0.476
 Duration of intervention > 6.5 montha  − 4.91 (− 8.56, − 1.27) 0.008
Follow-up
 Type of follow-up
  Others Ref -
  Face-to-face  − 1.80 (− 5.97, 2.38) 0.398
 Frequency of follow-up
  Other Ref -
  Weekly/ Monthly 0.004 (− 5.57, 5.58) 0.999
 Duration of follow-up > 12 monthsa 0.07 (− 3.81, 3.96) 0.970
Funding source
 Non-industry Ref -
 Industry  − 0.42 (− 4.84, 4.00) 0.853
  1. aThe cut-off point was determined by using the median value
  2. Ref reference category/level