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Table 1 Demographic characteristics of children in the study sample, overall and by experimental arm

From: Incentive delivery timing and follow-up survey completion in a prospective cohort study of injured children: a randomized experiment comparing prepaid and postpaid incentives

  Incentive timing  
  Before survey
(N = 204)
N (%)
After survey
(N = 216)
N (%)
Overall
(N = 420)
N (%)
Age in yearsa 6.6 [2.9, 11.4] 8.3 [2.5, 11.9] 7.2 [2.6, 11.7]
Female 77 (37.7) 78 (36.1) 155 (36.9)
Race
 American Indian or Alaska Native 1 (0.5) 1 (0.5) 2 (0.5)
 Asian 2 (1.0) 5 (2.3) 7 (1.7)
 Black or African American 40 (19.6) 54 (25.0) 94 (22.4)
 White 149 (73.0) 123 (56.9) 272 (64.8)
 More than one 10 (4.9) 26 (12.0) 36 (8.6)
 Other 2 (1.0) 6 (2.8) 8 (1.9)
 Unknown 0 (0.0) 1 (0.5) 1 (0.2)
Ethnicity
 Hispanic or Latino 22 (10.8) 25 (11.6) 47 (11.2)
 Not Hispanic or Latino 180 (88.2) 191 (88.4) 371 (88.3)
 Unknown 2 (1.0) 0 (0.0) 2 (0.5)
Parent preferred language-Spanish 8 (3.9) 7 (3.2) 15 (3.6)
Insurance
 Private/commercial 94 (46.1) 93 (43.1) 187 (44.5)
 Medicaid/Medicare 89 (43.6) 105 (48.6) 194 (46.2)
 Self-Pay/no insurance 9 (4.4) 3 (1.4) 12 (2.9)
 More than one/other 10 (4.9) 13 (6.0) 23 (5.5)
 Unknown 2 (1.0) 2 (0.9) 4 (1.0)
Annual household income
 Less than $15,000 32 (15.7) 34 (15.7) 66 (15.7)
 $15,000-$19,999 8 (3.9) 13 (6.0) 21 (5.0)
 $20,000-$29,999 15 (7.4) 23 (10.6) 38 (9.0)
 $30,000-$39,999 12 (5.9) 21 (9.7) 33 (7.9)
 $40,000-$49,999 18 (8.8) 19 (8.8) 37 (8.8)
 $50,000-$74,999 25 (12.3) 26 (12.0) 51 (12.1)
 ≥ $75,000 73 (35.8) 69 (31.9) 142 (33.8)
 Unknown 21 (10.3) 11 (5.1) 32 (7.6)
Household size
 2 8 (3.9) 11 (5.1) 19 (4.5)
 3-4 110 (53.9) 119 (55.1) 229 (54.5)
 5 or more 83 (40.7) 81 (37.5) 164 (39.0)
 Unknown 3 (1.5) 5 (2.3) 8 (1.9)
Primary caregiver education
 High school/GED or less 70 (34.3) 80 (37.0) 150 (35.7)
 Associates/vocational degree/some college 46 (22.5) 65 (30.1) 111 (26.4)
 Bachelor’s degree 40 (19.6) 41 (19.0) 81 (19.3)
 Graduate degree 37 (18.1) 24 (11.1) 61 (14.5)
 Unknown 11 (5.4) 6 (2.8) 17 (4.0)
  1. aSummarized as median [25th percentile, 75th percentile]