Table 1.
Comparison of Sample Characteristics between the Internet Sample and Primary Care Sample
| Characteristics | Study (Internet) Sample | Primary Care Sample Age 18 to 29 Years | PValue Comparison* |
|---|---|---|---|
| Total Sample | N = 10,642 | N = 351 | |
| Demographic factors | |||
| Sex,% | ≤.001 | ||
| Female | 75.9 | 83.2 | |
| Male | 24.2 | 16.8 | |
| Ethnicity,% | ≤.001 | ||
| White | 78.3 | 59.5 | |
| African-American | 4.9 | 9.2 | |
| Asian-American | 6.9 | 3.5 | |
| Latino/a | 5.7 | 21.2 | |
| Native American | 1.0 | 5.1 | |
| Pacific Islander | 0.4 | 1.6 | |
| Other race | 3.6 | Not available | |
| Education (% in each category) | |||
| Less than high school | 19.1 | 12.3 | NA† |
| High school graduate | 26.0 | 32.3 | NA† |
| Some college | 16.9 | 38.3 | NA† |
| College graduate | 37.9 | 17.1 | NA† |
| Mean income household | |||
| income, $ | 15,700* | 14,766.81 | NA† |
| Illness factors, % | |||
| CES-D score >mean score | 34.8 | 31.1 | ≥.05 |
| CES-D score >16 | 12.7 | 12.1 | ≥.05 |
| CES-D score >24 | 87.3 | 87.9 | ≥.05 |
| Symptoms of mental disorders, % | |||
| Panic attack symptoms | 52.5 | Not available | NA‡ |
| Generalized anxiety symptoms | 76.5 | Not available | NA‡ |
| Drinking more alcohol than Usual | 19.9 | Not available | NA‡ |
| 5 or more drinks in 1 day in last 4 weeks | 27.1 | Not available | NA‡ |
| Treatment history, % | ≤.001 | ||
| Medications only | 12.9 | 3.8 | |
| Counseling only | 8.4 | 26.6 | |
| Both | 21.1 | 30.4 | |
| Neither | 56.2 | 39.2 | |
| Family history of depression | |||
| Present | 45.9 | Not available | NA‡ |
| Absent | 53.4 | Not available | NA‡ |
NA = Not applicable.
* P values for either the Pearson χ2 test or Fisher exact test, as appropriate.
† No statistical comparison made between information derived from Zip code level data in the Internet sample and individual responses in the primary care sample, as group-level data cannot be compared with individual-level data.
† No statistical comparison made because of no available data.