Table 1

Participant characteristics at enrollment (N = 226 randomized)

CGM-only group (n = 149)CGM+BGM group (n = 77)
Age (years)44 ± 1445 ± 13
 Range19–7825–69
Diabetes duration (years)23 ± 1225 ± 12
 Range2–644–58
BMI (kg/m2)27.7 ± 4.126.5 ± 4.9
Female sex71 (48)41 (53)
Race/ethnicity
 White non-Hispanic139 (93)68 (88)
 Hispanic or Latino4 (3)5 (6)
 Black/African American4 (3)1 (1)
 Asian2 (1)2 (3)
 Other/unknown0 (0)1 (1)
Annual household income ($)*
 <50,00018 (16)7 (12)
 >50,000–100,00039 (35)17 (30)
 ≥100,00054 (49)33 (58)
Highest education*
 Less than bachelor’s degree35 (24)12 (16)
 Bachelor’s degree75 (51)35 (48)
 Postbachelor’s degree38 (26)26 (36)
Insurance*
 Private132 (89)66 (88)
 Other15 (10)7 (9)
 None2 (1)2 (3)
CGM use before study
 Never used CGM26 (17)14 (18)
 In past, but not current54 (36)25 (32)
 Current Dexcom CGM user49 (33)28 (36)
 Current Medtronic CGM user20 (13)10 (13)
Central laboratory HbA1c value
 <7.0% (53 mmol/mol)59 (40)39 (51)
 7.0–8.0% (53–64 mmol/mol)79 (53)31 (40)
 ≥8.0% (64 mmol/mol)11 (7)7 (9)
 % (mmol/mol)7.1 ± 0.7 (54 ± 7.7)7.0 ± 0.7 (53 ± 7.7)
Self-reported BGM testing times/day5.2 ± 2.14.9 ± 1.9
Clarke Hypoglycemia Unawareness Survey total score
 0100 (67)53 (69)
 134 (23)14 (18)
 215 (10)10 (13)
  • Data are mean ± SD or n (%) unless otherwise indicated.

  • *Missing data for CGM-only and CGM+BGM groups: annual income for 38 and 20, education for 1 and 4, and insurance for 0 and 2, respectively;

  • †The local laboratory HbA1c value was used for one participant in the CGM+BGM group whose central laboratory value was unavailable.