TABLE 3.
Descriptive statistics of variables from the NHANES sample1
| Variable | Mean | SD | Min | Max | Skew | Kurtosis |
|---|---|---|---|---|---|---|
| Age | 49.64 | 18.31 | 20 | 85 | 0.14 | −1.12 |
| Cotinine | 59.78 | 129.2 | 0.01 | 1438 | 2.60 | 8.11 |
| Food security | 0.24 | 1.45 | 0 | 10 | 5.94 | 33.85 |
| DPQ010: …little interest or pleasure in doing things? | 0.34 | 0.71 | 0 | 3 | 2.27 | 4.71 |
| DPQ020: …feeling down, depressed, or hopeless? | 0.36 | 0.72 | 0 | 3 | 2.24 | 4.58 |
| DPQ030: …trouble falling or staying asleep, or sleeping too much? | 0.63 | 0.95 | 0 | 3 | 1.41 | 0.84 |
| DPQ040: …feeling tired or having little energy? | 0.74 | 0.93 | 0 | 3 | 1.18 | 0.46 |
| DPQ050: …poor appetite or overeating? | 0.37 | 0.76 | 0 | 3 | 2.24 | 4.30 |
| DPQ060: …feeling bad about yourself—or that you are a failure or have let yourself or your family down? | 0.25 | 0.63 | 0 | 3 | 2.88 | 8.20 |
| DPQ070: …trouble concentrating on things, such as reading the newspaper or watching TV? | 0.25 | 0.64 | 0 | 3 | 2.88 | 8.13 |
| DPQ080: …moving or speaking so slowly that other people could have noticed? Or the opposite—being so fidgety or restless that you have been moving around a lot more than usual? | 0.16 | 0.52 | 0 | 3 | 3.73 | 14.61 |
| DPQ090: …thoughts that you would be better off dead or of hurting yourself in some way? | 0.06 | 0.31 | 0 | 3 | 6.81 | 52.02 |
1
DPQ, NHANES depression screener questionnaire.