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. Author manuscript; available in PMC: 2020 Dec 1.
Published in final edited form as: Clin Trials. 2020 Jul 6;17(6):664–674. doi: 10.1177/1740774520933362

Table 3.

Participant characteristics by recruitment method

Data are mean ± SD or n (%) In-person (n=41) Mailing (n=11) Social media (n=27) p-valuea
Demographic
Age (years) 21.4 ± 3.0 21.5 ± 1.5 24.6 ± 3.8 <0.01
Gender (n=female) 18 (44) 8 (73) 23 (85) <0.01
Generation
 Participant born outside United States 14 (34) 0 (0) 6 (22) 0.06
 Neither parent born in United States 18 (44) 7 (64) 9 (33)
 At least one parent born in the United States 9 (22) 4 (36) 12 (44)
Race/Ethnicity
 White 1 (2) 1 (9) 6 (22) 0.13
 Black 4 (10) 2 (18) 2 (7)
 Hispanic/Latino 35 (85) 8 (73) 18 (67)
 Other 1 (2) 0 (0) 1 (4)
Parents’ highest education level
 < high school 16 (46) 7 (64) 4 (15) 0.04
 High school degree/GED 7 (20) 3 (27) 7 (27)
 Some college, trade, tech 4 (11) 0 (0) 8 (31)
 College graduate+ 8 (23) 1 (9) 7 (27)
Neighborhood median household income ($K) 39.1 ± 12.1 44.9 ± 19.2 50.8± 17.9 0.03
Neighborhood % below Federal Poverty Level 25.2 ± 9.6 25.8 ± 16.1 20.6 ± 11.3 0.13
Clinical
Type 1 Diabetes 33 (80) 8 (73) 19 (70) 0.62
Type 2 Diabetes 8 (20) 3 (27) 8 (30)
Diabetes duration 9.5 ± 5.6 11.1 ± 4.4 9.6 ± 6.6 0.61
A1C 10.6 ± 1.6 11.4 ± 2.3 10.8 ± 2.1 0.66
Blood glucose monitoring (Summary of Diabetes Self-Care Activities, SDSCA)42 3.8 ± 2.4 2.9 ± 2.7 2.8 ± 3.0 0.25
Medication adherence (SDSCA) 6.4 ± 1.4 4.6 ± 2.7 5.6 ± 1.8 0.01
Habit strength for glucose monitoring (Self-Report Behavioural Automaticity Index, SRBAI)43 16.8 ± 6.5 12.6 ± 7.3 12.7 ± 6.6 0.03
Habit strength for taking medications (SRBAI) 19.7 ± 5.7 17.4 ± 8.0 18.1 ± 6.7 0.60
Source of care
 Endocrinology 37 (95) 5 (45) 13 (48) <0.01
 Primary care 1 (3) 5 (45) 8 (30)
 No regular source of care 0 (0) 1 (9) 4 (15)
 Unknownb 1 (3) 0 (0) 2 (7)
Healthcare utilization (12mo prior randomization)
 Number of routine diabetes visits 3.6 ± 1.5 2.4 ± 1.9 2.7 ± 1.9 0.03
 ≥2 visits with A1C recorded ≥3 months apart 35 (85) 4 (40) 9 (36) <0.01
 Participants reporting ≥1 diabetes-related hospitalization 9 (22) 2 (18) 7 (26) 0.93
Psychosocial
Diabetes distress (Problem Areas in Diabetes-Short Form, PAID-SF; range: 0–20) 44 8.6 ± 6.0 8.5 ± 4.6 11.9 ± 5.2 0.06
Audit of Diabetes-Dependent Quality of Life (ADDQoL; range: −3 to +9) 45 −2.3 ± 1.7 −1.8 ± 1.3 −3.3 ± 1.7 0.02
Diabetes knowledge (Diabetes knowledge Questionnaire, DKQ; range: 0–24) 46 17.2 ± 3.3 18.3 ± 3.8 19.4 ± 2.2 0.02
Participation Objective, Participation Subjective (Objective range: weighted z scores −3 to 3, Subjective range −4 to +4) 47 −0.1 ± 0.2 −0.1 ± 0.3 0.1 ± 0.3 0.06
a

Kruskal-Wallace Test or Fisher Exact Test for global difference between the 3 recruitment strategies

b

Participants had a provider, but specialist vs. primary care physician status could not be determined.