Table 2.
Cross-Sectional Association of Phasor Angle and Phasor Magnitude With Cognition. Adjusted Means or Beta Coefficient (95% Confidence Interval)
| Phasor Predictor | Trails B Test Completion Time, sec | 3MS Score | ||
|---|---|---|---|---|
| Minimally* | Multivariable† | Minimally* | Multivariable† | |
| Adjusted | Adjusted | Adjusted | Adjusted | |
| Phasor angle, hours | ||||
| Continuous, per SD increase (1.30), beta coefficient | 1.9 (−1.6, 5.5) | 2.0 (−1.5, 5.7) | −0.1 (−0.5, 0.2) | −0.17 (−0.5, 0.2) |
| Q1: <−0.967 | 114.8 (108.9, 121.0) | 113.4 (107.5, 119.7) | 92.7 (92.1, 93.4) | 93.0 (92.3, 93.6) |
| Q2: −0.967 to <−0.305 | 119.7 (113.6, 126.1) | 117.4 (111.3, 123.9) | 92.6 (91.9, 93.2) | 92.7 (92.1, 93.4) |
| Q3: −0.305 to <0.403 | 114.9 (109.0, 121.2) | 112.9 (106.9, 119.2) | 92.9 (92.2, 93.5) | 92.9 (92.2, 93.6) |
| Q4: ≥0.403 | 116.5 (110.5, 122.9) | 116.0 (109.7, 122.6) | 92.6 (91.9, 93.2) | 92.6 (91.9, 93.3) |
| p-trend | .97 | .82 | .97 | .59 |
| Phasor magnitude | ||||
| Continuous, per SD decrease (−0.09), beta coefficient | 3.7 (−0.2, 7.7) | 2.3 (−1.8, 6.6) | −0.1 (−0.5, 0.2) | 0.06 (−0.3, 0.4) |
| Q1: <0.175 | 122.5 (116.0, 129.5)‡ | 120.3 (113.5, 127.5) | 92.6 (91.9, 93.2) | 92.9 (91.2, 93.6) |
| Q2: 0.175 to <0.238 | 116.7 (110.7, 123.1) | 114.4 (108.4, 120.8) | 92.7 (92.1, 93.4) | 92.8 (92.2, 93.5) |
| Q3: 0.238 to <0.303 | 115.8 (109.9, 122.0) | 113.4 (107.4, 119.6) | 92.6 (91.9, 93.2) | 92.8 (92.1, 93.4) |
| Q4: ≥0.303 | 111.4 (105.5, 117.5) | 112.1 (106.0, 118.6) | 92.9 (92.2, 93.6) | 92.8 (92.1, 93.4) |
| p-trend | .02 | .12 | .57 | .80 |
Notes: A higher value for Trails B completion time denotes worse cognitive function. A lower value for 3MS score denotes worse cognitive function. SD = standard deviation; 3MS = Modified Mini-Mental State examination.
*Minimally adjusted: clinic, age, race, education level, and season.
†Multivariable adjusted: clinic, age, race, education level, season, alcohol use, living alone, caffeine intake, depressive symptoms, physical activity, body mass index, history of cataracts that were not corrected, and number of comorbid conditions.
‡ p < .05.