Table 1.
Demographic characteristics of the replication sample (NHANES 2005–2006 cycle) and frequency of suicidal ideation according to each demographic characteristic.
| Characteristic | Overall sample (N = 4,773) | Not at all (n = 4,578) | Several days (n = 133) | More than half the days (n = 39) | Nearly every day (n = 28) | Percent imputed |
|---|---|---|---|---|---|---|
| Age | 48(19) | 48 | 48 | 45 | 43 | 0.00 |
| Gender, female | 52% | 52% | 56% | 71% | 72% | 0.00 |
| Race-ethnicity | 0.00 | |||||
| Non-Hispanic white | 72% | 72% | 57% | 58% | 37% | |
| Non-Hispanic black | 11% | 11% | 13% | 16% | 24% | |
| Mexican American | 8% | 8% | 10% | 15% | 13% | |
| Other | 9% | 8% | 19% | 11% | 26% | |
| Poverty-to-income | 2.66(1.64) | 2.71 | 1.85 | 1.66 | 1.37 | 4.76 |
| Educational attainment | 2.77 | |||||
| Less than 9th grade | 7% | 7% | 10% | 12% | 16% | |
| 9th through 11th | 11% | 11% | 15% | 19% | 23% | |
| High school diploma | 25% | 25% | 30% | 28% | 30% | |
| Some college | 31% | 31% | 30% | 35% | 26% | |
| College graduate | 26% | 27% | 15% | 6% | 5% | |
| Marital status | 1.63 | |||||
| Married | 61% | 61% | 40% | 32% | 26% | |
| Widowed | 7% | 7% | 5% | 6% | 4% | |
| Divorced | 11% | 11% | 23% | 12% | 26% | |
| Separated | 3% | 3% | 2% | 19% | 1% | |
| Never Married | 11% | 11% | 21% | 16% | 34% | |
| Cohabiting | 8% | 8% | 9% | 16% | 10% | |
| Smoking status | 0.08 | |||||
| Non-smoker | 51% | 51% | 52% | 57% | 42% | |
| Ex-smoker | 25% | 25% | 17% | 8% | 16% | |
| Current smoker | 24% | 24% | 32% | 34% | 42% | |
| Alcoholic drinks/week | 3.26 (8.43) | 3.21 | 3.38 | 4.11 | 9.40 | 9.03 |
| Alcoholic binges/week | 0.14 (.88) | 0.13 | 0.18 | 0.37 | 0.73 | 12.42 |
| Depression | 3% | 1% | 30% | 73% | 92% | 9.47 |
| Overall insomnia | 3.67 (3.25) | 3.56 | 5.88 | 6.57 | 7.89 | —a |
| Difficulty falling asleep | 0.00 | |||||
| Never | 40% | 40% | 31% | 23% | 22% | |
| Rarely | 23% | 23% | 8% | 10% | 5% | |
| Sometimes | 22% | 22% | 26% | 16% | 18% | |
| Often | 9% | 8% | 13% | 36% | 20% | |
| Always | 7% | 7% | 22% | 16% | 35% | |
| Difficulty maintaining sleep | 0.10 | |||||
| Never | 35% | 36% | 19% | 8% | 3% | |
| Rarely | 21% | 21% | 9% | 14% | 2% | |
| Sometimes | 24% | 24% | 30% | 21% | 20% | |
| Often | 14% | 13% | 23% | 40% | 45% | |
| Always | 7% | 7% | 19% | 17% | 29% | |
| Early morning awakenings | 0.13 | |||||
| Never | 43% | 43% | 36% | 26% | 16% | |
| Rarely | 20% | 21% | 12% | 7% | 4% | |
| Sometimes | 19% | 20% | 20% | 12% | 17% | |
| Often | 11% | 11% | 13% | 34% | 30% | |
| Always | 6% | 6% | 19% | 22% | 33% | |
| Sleep duration (h) | 0.21 | |||||
| <= 4 | 5% | 4% | 14% | 23% | 26% | |
| 5 | 9% | 8% | 16% | 20% | 20% | |
| 6 | 23% | 23% | 20% | 16% | 25% | |
| 7 | 30% | 31% | 15% | 11% | 8% | |
| 8 | 27% | 27% | 22% | 22% | 7% | |
| 9 | 5% | 5% | 5% | 6% | 14% | |
| >= 10 | 3% | 2% | 7% | 2% | 1% |
aOverall insomnia is a composite of Difficulty falling asleep, Difficulty maintaining sleep, and early morning awakenings. It was created post-imputation for each imputed dataset. N = 4,773. M(SD).