Table 2.
Characteristics of those responding by mail, online, or self-referred (trials #1 and #2 combined)
| Responded by Mail1 (N = 3,443) |
Responded Online (N = 2,434) |
Self-Referred (N = 87) |
p-value | Effect Size Estimate: M vs. O |
Effect Size Estimate: M vs. SR |
Effect Size Estimate: O vs. SR |
|
|---|---|---|---|---|---|---|---|
| Eating Disorder Scores | |||||||
| Binge 1× per week over last 3 months |
16.12% | 26.34% | 93.51% | < .0001 | 10 | 2 | 2 |
| Binge 2× per week over last 3 months |
13.53% | 22.68% | 84.42% | < .0001 | 11 | 2 | 2 |
| ED-related Impairment2 | 63.29% | 58.31% | 77.65% | < .0001 | 21 | 7 | 6 |
|
Prevalence of Obesity (BMI ≥ 30) |
34.07% | 47.41% | 60.92% | < .0001 | 8 | 4 | 8 |
| Demographics | |||||||
| Age | 39.52a (7.21) | 38.46b (7.25) | 36.69b (7.34) | < .0001 | N/A | N/A | N/A |
| Race/Ethnicity | |||||||
| White/Non-Hispanic | 96.88% | 96.77% | 93.22% | ||||
| Other | 3.12% | 3.23% | 6.78% | .2881 | 910 | 28 | 29 |
| Highest Grade Completed | 19.67% | 14.33% | 9.20% | ||||
| Up to high school grad | 80.33% | 85.67% | 90.80% | < .0001 | 19 | 10 | 20 |
| Some college & higher | |||||||
| Marital Status | |||||||
| Married | 66.55% | 68.83% | 65.52% | ||||
| Widowed | 0.73% | 0.46% | 1.15% | ||||
| Divorced | 11.09% | 8.59% | 16.09% | ||||
| Separated | 1.61% | 1.49% | 2.30% | .0640 | N/A | N/A | N/A |
| Never Married | 11.94% | 12.70% | 8.05% | ||||
| Unmarried Couple | 8.09% | 7.93% | 6.90% | ||||
| Income | |||||||
| $49,999 or less | |||||||
| $50,000 or more | 39.71%60.29% | 36.61%63.39% | 55.42%44.58% | .0004 | 32 | 7 | 6 |
1
Includes 6 early respondents who were screened by telephone
2
Total N for responded by mail = 899; total N for responded online = 909; Total N for self-referred = 85
Note: a, b and c superscripts denote groups that are statistically different using multiple comparison procedures; M=mail/phone response, O=online response, and SR = self-referred