Table 2.
Multilevel Models Examining Diurnal Alpha-Amylase Rhythms by Negative Daily Interactions and Age
| Model 1 | Model 2 | |||||||
|---|---|---|---|---|---|---|---|---|
| Step 1 | Step 2 | Step 1 | Step 2 | |||||
| INT | INT | AR | WES | INT | INT | AR | WES | |
| b (SE) | b (SE) | b (SE) | b (SE) | b (SE) | b (SE) | b (SE) | b (SE) | |
| Sample average | 4.592 (0.18)** | 4.594 (0.18)** | 4.593 (0.18)** | 4.626 (0.19)** | ||||
| Same day interactions | −0.015 (0.03) | 0.036 (0.04) | −0.204 (0.10)* | −0.005 (0.00) | −0.077 (0.06) | −0.019 (0.08) | −0.003 (0.21) | −0.012 (0.01) |
| Previous day interaction | 0.026 (0.03) | 0.014 (0.04) | 0.074 (0.10) | 0.001 (0.00) | 0.020 (0.07) | 0.047 (0.10) | 0.155 (0.28) | −0.008 (0.01) |
| Same day interaction × age | ||||||||
| Middle-aged | 0.095 (0.07) | 0.041 (0.10) | −0.035 (0.26) | 0.012 (0.01) | ||||
| Young-old | 0.056 (0.07) | 0.092 (0.10) | −0.456 (0.26) | 0.005 (0.01) | ||||
| Oldest-old | – | – | – | – | ||||
| Previous day interaction × age | ||||||||
| Middle-aged | 0.008 (0.08) | −0.053 (0.11) | 0.016 (0.32) | 0.011 (0.01) | ||||
| Young-old | 0.006 (0.08) | −0.046 (0.12) | −0.131 (0.34) | 0.013 (0.01) | ||||
| Oldest-old | – | – | – | – | ||||
| −2 log likelihood | 2,268.9 | 2,263.6 | 2,267.0 | 2,248.5 | ||||
| Change in likelihood | 5.3 | 18.5 | ||||||
Note: AR = awakening response; INT = intercept; WES = wake-evening slope. Models include the quadratic decline and controlled for age group, gender, race, self-rated health, education, neuroticism, medication use, smoking, and weekend sample. Change in likelihood for Step 2 is change from Step 1.
*p ≤ .05. **p ≤ .01.