| Model I | Model II | Model III | Model IV | Model V |
---|---|---|---|---|---|
Sleeping hours/day | |||||
  ≤ 5 h (7–8) | 1.18*** |  | 1.15*** | 1.15*** | 1.08* |
 6 h (7–8) | 1.14*** |  | 1.13** | 1.12** | 1.08* |
 9 h (7–8) | 1.06 |  | 1.07 | 1.08 | 1.09+ |
  ≥ 10 h (7–8) | 1.30*** |  | 1.29*** | 1.27*** | 1.18*** |
Frequency of vegetable consumption | |||||
 High (low) |  | 0.78*** | 0.80*** | 0.82*** | 0.91* |
Covariates | |||||
 Demographics | |||||
  Age (mean, years) | 1.08*** | 1.08*** | 1.07*** | 1.07*** | 1.06*** |
  Men (women) | 1.24*** | 1.25*** | 1.34*** | 1.44*** | 1.52*** |
  Urban (rural) | 0.88*** | 0.89*** | 0.94* | 0.97 | 0.93** |
Socioeconomic factors | |||||
 1+ years of schooling (0) |  |  | 0.95 | 0.97 | 1.02 |
 Economic independence (no) |  |  | 0.71*** | 0.77*** | 0.78*** |
 Professional occupation (no) |  |  | 1.09+ | 1.11* | 1.07 |
 Access to healthcare (no) |  |  | 0.90** | 0.91* | 0.95 |
Family/Social support | |||||
 Currently married (no) |  |  |  | 0.80*** | 0.81*** |
 Close proximity to children (no) |  |  |  | 1.09* | 1.07* |
Health practice | |||||
 Doing regular exercise (no) |  |  |  | 0.92* | 0.96 |
 Currently smoking (no) |  |  |  | 0.69*** | 0.78*** |
Health condition | |||||
 ADL disabled (no) |  |  |  |  | 1.60*** |
 Cognitively impaired (no) |  |  |  |  | 1.47*** |
 Self-reported good health (no) |  |  |  |  | 1.16*** |
 N (observations) | 20,774 | 20,774 | 20,774 | 20,774 | 20,774 |
 -log likelihood | 15,763.3*** | 15,997.0*** | 15,681.2*** | 15,566.0*** | 15,209.9*** |