Table 4 Longitudinal mediation models across sex and age.
From: Physical activity partly mediates the association between cognitive function and depressive symptoms
Model 1 Cognitive function → (a) physical activity → (b) depressive symptoms | Model 2 Physical activity → (a) cognitive function → (b) depressive symptoms | |||||||
|---|---|---|---|---|---|---|---|---|
Men | Women | Men | Women | |||||
<65 | ≥65 | <65 | ≥65 | <65 | ≥65 | <65 | ≥65 | |
n | 12,109 | 11,083 | 15,335 | 12,664 | 12,109 | 11,083 | 15,335 | 12,664 |
Unstandardized B (95% CI) | Unstandardized B (95% CI) | |||||||
a1 | 0.007 (−0.002, 0.016) | 0.029*** (0.019, 0.039) | 0.022*** (0.014, 0.030) | 0.057*** (0.047, 0.066) | 0.054* (0.003, 0.105) | 0.120*** (0.077, 0.165) | 0.113*** (0.065, 0.159) | 0.176*** (0.138, 0.214) |
b1 | −0.097*** (−0.143, −0.052) | −0.151*** (−0.195, −0.107) | −0.176*** (−0.222, −0.129) | −0.131*** (−0.172, −0.090) | −0.028** (−0.045, −0.012) | −0.057*** (−0.076, −0.039) | −0.023** (−0.039, −0.007) | −0.067*** (−0.085, −0.050) |
c’1 (Direct effect) | −0.030** (−0.049, −0.011) | −0.059*** (−0.079, −0.039) | −0.021* (−0.040, −0.002) | −0.062*** (−0.082, −0.041) | −0.063* (−0.114, −0.011) | −0.102*** (−0.152, −0.051) | −0.183*** (−0.236, −0.131) | −0.120*** (−0.167, −0.073) |
Total effect 1 | −0.030** (−0.049, −0.011) | −0.064*** (−0.084, −0.043) | −0.024* (−0.043, −0.006) | −0.069*** (−0.089, −0.049) | −0.064* (−0.115, −0.013) | −0.108*** (−0.158, −0.058) | −0.186*** (−0.238, −0.133) | −0.132*** (−0.179, −0.085) |
Indirect effect 1 | −0.001 (−0.002, 0.000) | −0.004*** (−0.007, −0.003) | −0.004*** (−0.006, −0.002) | −0.007*** (−0.010, −0.005) | −0.002 (−0.004, 0.000) | −0.007*** (−0.011, −0.004) | −0.003* (−0.005, −0.001) | −0.012*** (−0.016, −0.008) |
Proportion of mediation effect 1 | 3% | 6% | 17% | 10% | 3% | 6% | 2% | 9% |
a2 | 0.013** (0.016, 0.050) | 0.045*** (0.035, 0.056) | 0.030*** (0.023, 0.037) | 0.055*** (0.045, 0.064) | 0.067** (0.020, 0.113) | 0.097*** (0.057, 0.136) | 0.129*** (0.089, 0.170) | 0.162*** (0.127, 0.198) |
b2 | −0.083 (−0.169, 0.004) | −0.176*** (−0.255, −0.098) | −0.104* (−0.197, −0.011) | −0.164*** (−0.237, −0.093) | −0.011 (−0.045, 0.023) | −0.107*** (−0.141, −0.073) | −0.021 (−0.053, 0.012) | −0.074*** (−0.106, −0.041) |
c’2 (Direct effect) | 0.017 (−0.021, 0.054) | −0.072*** (−0.109, −0.035) | −0.032 (−0.068, 0.004) | −0.078*** (−0.114, −0.041) | −0.053 (−0.162, 0.057) | −0.096* (−0.188, −0.007) | −0.070 (−0.175, 0.032) | −0.163*** (−0.249, −0.079) |
Total effect 2 | 0.016 (−0.022, 0.053) | −0.080*** (−0.117, −0.043) | −0.035 (−0.070, 0.001) | −0.087*** (−0.123, −0.050) | −0.054 (−0.162, 0.056) | −0.106* (−0.198, −0.017) | −0.072 (−0.177, 0.029) | −0.175*** (−0.261, −0.091) |
Indirect effect 2 | −0.001 (−0.003, 0.000) | −0.008*** (−0.012, −0.004) | −0.003* (−0.006, 0.000) | −0.009*** (−0.013, −0.005) | −0.001 (−0.004, 0.002) | −0.010*** (−0.016, −0.005) | −0.003 (−0.007, 0.002) | −0.012*** (−0.018, −0.006) |
Proportion of mediation effect 2 | NA | 10% | 9% | 10% | 2% | 9% | 4% | 7% |
AIC | 339384.279 | 330806.444 | 452378.299 | 405070.761 | 339400.979 | 330891.292 | 452360.175 | 405187.988 |
X2 (df) | 1779.333 (37)*** | 2391.406 (37)*** | 3074.899 (37)*** | 3234.749 (37)*** | 1796.033 (37)*** | 2476.254 (37)*** | 3056.775 (37)*** | 3351.976 (37)*** |
RMSEA (95% CI) | 0.062 (0.060–0.065) | 0.076 (0.073–0.078) | 0.073 (0.071–0.075) | 0.083 (0.080–0.085) | 0.063 (0.060–0.065) | 0.077 (0.075–0.080) | 0.073 (0.071–0.075) | 0.084 (0.082–0.087) |
CFI | 0.880 | 0.867 | 0.859 | 0.870 | 0.879 | 0.863 | 0.860 | 0.865 |
TLI | 0.796 | 0.774 | 0.759 | 0.779 | 0.795 | 0.766 | 0.761 | 0.770 |
SRMR | 0.065 | 0.086 | 0.074 | 0.089 | 0.066 | 0.092 | 0.075 | 0.096 |
