Table 3.
Predictor differences in participants who remained in the study vs. withdrew.
| Remained in Study | Withdrew | ||
|---|---|---|---|
| (n = 11,751) |
(n = 127) |
||
| Variable | Mean (SD) | Mean (SD) | p-value |
| # Missed Annual Visits | 0.06 (0.29) | 0.48 (0.50) | < 0.001 |
| Average Visit Satisfaction (range [0,2]) | 1.69 (0.35) | 1.54 (0.40) | < 0.001 |
| Distance (kilometers) | 24.60 (95.22) | 18.22 (30.94) | 0.463 |
| Age (months) | 118.93 (7.46) | 119.96 (7.36) | 0.122 |
| n (%) | n (%) | p-value | |
| Male Child | 6127 (52.2) | 61 (48.0) | 0.4 |
| Parental Marital Status | 7900 (67.8) | 90 (70.9) | 0.524 |
| Parental Spanish Preference | 636 (5.4) | 15 (11.8) | 0.003 |
| Child’s Race | 0.077 | ||
| White | 7443 (64.3) | 80 (65.0) | |
| Asian | 271 (2.3) | 5 (4.1) | |
| African American | 1856 (16.0) | 11 (8.9) | |
| Other/Mixed | 2009 (17.4) | 27 (22.0) | |
| Parental Education | 0.759 | ||
| Less Than HS Diploma | 773 (6.6) | 12 (9.4) | |
| HS/GED | 1246 (10.6) | 12 (9.4) | |
| Some College | 3448 (29.4) | 38 (29.9) | |
| Bachelor’s Degree | 3296 (28.1) | 35 (27.6) | |
| Post Graduate | 2965 (25.3) | 30 (23.6) | |
| Parental Employment | 0.017 | ||
| Working Full/Part Time | 8137 (69.3) | 81 (63.8) | |
| Maternity Leave | 30 (0.3) | 0 (0.0) | |
| Sick Leave | 21 (0.2) | 0 (0.0) | |
| Temporarily Laid Off | 85 (0.7) | 4 (3.1) | |
| Stay at Home Parent | 2047 (17.4) | 24 (18.9) | |
| Unemployed, Looking | 494 (4.2) | 4 (3.1) | |
| Unemployed, Not Looking | 84 (0.7) | 3 (2.4) | |
| Student | 242 (2.1) | 3 (2.4) | |
| Disabled | 256 (2.2) | 3 (2.4) | |
| Retired | 71 (0.6) | 3 (2.4) | |
| Other | 228 (1.9) | 2 (1.6) | |
| Refuse to Answer | 54 (0.5) | 0 (0.0) | |
| Household Income | 0.244 | ||
| < $50 K | 3185 (29.6) | 37 (33.3) | |
| ≥ $50 K & < $100 K | 3034 (28.2) | 36 (32.4) | |
| ≥ $100k | 4527 (42.1) | 38 (34.2) | |
| MRI Reviewed | 510 (4.3) | 6 (4.7) | 1 |
| Ancillary Study Participation | 2488 (21.2) | 0 (0.0) | < 0.001 |
Note. Sociodemographic variables (i.e. Age, Distance, Male, Married, Spanish preferred, Race, Education, Employment, and Household Income), are values at baseline only. Mixed/other race includes American Indian, Alaskan Native, Guamanian, Samoan, Other Pacific Islander, and other races not specified. Average Visit satisfaction averages participants’ visit satisfaction across all visits. MRI Reviewed and Ancillary study participant variables are indicators for whether these occurred at any point in the study. # Missed Visits variable is cumulative across the study.
Bold type indicates significance at Bonferroni-corrected p < .0036.