Table 3.
β-Estimates for total cognitive score according to objectively measured PA in monozygotic and dizygotic twins
| Level of PA | Within-family analyses |
|
|---|---|---|
| Model 1 | Model 2 | |
| Monozygotic twins (n = 267 twins, 110 pairs) | ||
| MVPA, h | 0.29 (−1.98 to 2.56) | 0.22 (−2.08 to 2.53) |
| LPA, h | 0.95 (−0.30 to 2.20) | 1.08 (−0.10 to 2.26) |
| SB, h | −0.74 (−1.63 to 0.15) | −0.77 (−1.61 to 0.08) |
| The mean daily MET | 4.60 (−3.39 to 12.6) | 4.82 (−2.62 to 12.3) |
| Daily step count (thousands) | 0.06 (−0.26 to 0.38) | 0.08 (−0.24 to 0.39) |
| Dizygotic twin (n = 412 twins, 125 pairs) | ||
| MVPA, h | 0.82 (−1.69 to 3.34) | 0.56 (−2.35 to 3.46) |
| LPA, h | 0.48 (−0.64 to 1.60) | 0.39 (−0.74 to 1.53) |
| SB, h | −0.30 (−1.13 to 0.53) | −0.27 (−1.20 to 0.67) |
| The mean daily MET, MET | 3.35 (−5.21 to 11.9) | 2.66 (−7.94 to 13.3) |
| Daily step count (thousands) | 1.12 (−0.31 to 0.57) | 0.11 (−0.36 to 0.58) |
Abbreviations: MVPA, moderate to vigorous physical activity; LPA, light physical activity; SB, sedentary behavior; MET, the metabolic equivalent of a task; PA, physical activity.
NOTE: In within-family analyses, twins were compared to their co-twins, and intrapair differences in PA are regressed on intrapair differences in cognition. Model 1 is adjusted for age. For analysis of the mean daily MET and SB, model 1 also adjusts for the accelerometer wearing time. Model 2 is adjusted for age, BMI in 2016, living condition, and years of education. In addition, accelerometer wearing time was adjusted when analyzing SB and the mean daily MET.