Table 4.
Sample sizes, rates, and hazard ratios for mortality from all-causes and diseases of the circulatory system among participants aged > = 20 years, National Health and Nutrition Examination Survey 1999-2002-2006
| Screen time (hours per day) | ||||
|---|---|---|---|---|
| < 2 | 2- < 4 | > = 4 | P for trend | |
| All-causes | ||||
| Unweighted no. deaths/no. at risk | 122/2088 | 223/3367 | 197/1895 | -- |
| Unweighted person-years | 11,892 | 19,218 | 10,393 | -- |
| Age-adjusted rate/1,000 PY (95% CI) | 8.7 (6.4, 10.9) | 9.1 (7.5, 10.7) | 11.0 (8.8, 13.2) | -- |
| Model 1 (hazard ratio, 95% CI) | 1.00 | 1.18 (0.87, 1.60) | 1.47 (1.15, 1.89) | 0.003 |
| Model 2 (hazard ratio, 95% CI) | 1.00 | 1.17 (0.86, 1.58) | 1.37 (1.09, 1.73) | 0.014 |
| Model 3 (hazard ratio, 95% CI) | 1.00 | 1.14 (0.84, 1.55) | 1.24 (0.96, 1.59) | 0.134 |
| Model 4 (hazard ratio, 95% CI) | 1.00 | 1.18 (0.87, 1.59) | 1.13 (0.88, 1.44) | 0.712 |
| Model 5 (hazard ratio, 95% CI) | 1.00 | 1.16 (0.86, 1.55) | 1.08 (0.85, 1.38) | 0.962 |
| Model 6 (hazard ratio, 95% CI) | 1.00 | 1.16 (0.86, 1.56) | 1.14 (0.90, 1.44) | 0.589 |
| Model 4: Exclude prevalent diabetes, cardiovascular disease, cancer | 1.00 | 1.15 (0.69, 1.92) | 0.96 (0.63, 1.47) | 0.406 |
| Model 5: Exclude deaths in year 1 | 1.00 | 1.20 (0.89, 1.61) | 1.11 (0.86, 1.42) | 0.917 |
| Diseases of the circulatory system | ||||
| Unweighted no. deaths/no. at risk | 46/2088 | 74/3367 | 70/1895 | -- |
| Unweighted person-years | 11,892 | 19,218 | 10,393 | -- |
| Age-adjusted rate/1,000 PY (95% CI) | 3.3 (2.0, 4.6) | 2.7 (1.8, 3.5) | 3.2 (2.4, 4.1) | -- |
| Model 1 (hazard ratio, 95% CI) | 1.00 | 0.82 (0.48, 1.40) | 1.05 (0.72, 1.53) | 0.388 |
| Model 2 (hazard ratio, 95% CI) | 1.00 | 0.84 (0.48, 1.46) | 1.00 (0.68, 1.48) | 0.606 |
| Model 3 (hazard ratio, 95% CI) | 1.00 | 0.86 (0.49, 1.54) | 0.96 (0.62, 1.48) | 0.880 |
| Model 4 (hazard ratio, 95% CI) | 1.00 | 0.90 (0.50, 1.64) | 0.87 (0.55, 1.36) | 0.578 |
| Model 5 (hazard ratio, 95% CI) | 1.00 | 0.96 (0.54, 1.71) | 0.88 (0.53, 1.45) | 0.555 |
| Model 6 (hazard ratio, 95% CI) | 1.00 | 0.98 (0.56, 1.71) | 0.96 (0.60, 1.52) | 0.845 |
| Model 4: Exclude prevalent diabetes, cardiovascular disease, cancer | 1.00 | 1.07 (0.46, 2.47) | 1.65 (0.75, 3.62) | 0.186 |
| Model 5: Exclude deaths in year 1 | 1.00 | 1.00 (0.55, 1.84) | 0.84 (0.48, 1.46) | 0.418 |
CI = confidence interval; PY = person-years
Model 1 is adjusted for age
Model 2 is adjusted for age, gender, race or ethnicity, educational attainment
Model 3 is adjusted for variables in model 2 plus smoking status, leisure-time physical activity, Healthy Eating Index score, and alcohol consumption
Model 4 is adjusted for variables in model 3 plus health status and health insurance coverage
Model 5 is adjusted for variables in model 4 plus histories of diabetes, cardiovascular disease, and cancer
Model 6 is adjusted for variables in model 5 plus body mass index, systolic blood pressure, and concentrations of high-density lipoprotein cholesterol, non-high-density lipoprotein cholesterol, and HbA1c