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Table 2 Age-specific direct and indirect relationship between depressive symptoms and cognitive functioning through BMI

From: Age and sex-specific associations between depressive symptoms, body mass index and cognitive functioning among Korean middle-aged and older adults: a cross-sectional analysis

Variables Mediator Outcome
BMI Cognitive Function
\(\beta\) SE t p \(\beta\) SE t P
CES-D × Age ≥ 70 -0.080** 0.026 -3.149 0.002     
Age ≥ 70 -0.110 0.115 -0.956 0.339     
CES-D 0.004 0.019 0.192 0.848 -0.323** 0.023 -14.352 0.000
BMI      0.139** 0.022 6.204 0.000
Covariates
 Sexa1 -0.319** 0.077 -4.134 0.000 0.614** 0.129 4.758 0.000
 Family Incomeb 0.125** 0.046 2.720 0.007 0.958** 0.072 13.253 0.000
 ADL -0.139** 0.045 -3.099 0.002 -2.084** 0.075 -27.884 0.000
 Marrieda2 0.094 0.092 1.015 0.310 1.431** 0.153 9.328 0.000
 Meet friendsa3 -0.082 0.095 -0.866 0.387 1.777** 0.160 11.134 0.000
 Good healtha4 -0.198** 0.086 -2.291 0.022 1.317** 0.142 9.254 0.000
 Regular Exercisea5 0.151* 0.077 1.948 0.052 1.144** 0.130 8.804 0.000
  R2 = 0.020, F (10, 5608) = 11.547, p < .000 R2 = 0.340, F (9, 5609) = 320.456, p < 0.000
  Indirect relationship between Depressive Symptoms and Cognitive Function through BMI
 Age Estimate SE 95% LLCI 95% ULCI
 Age < 70 0.001 0.003 -0.005 0.006
 Age ≥ 70 -0.011** 0.003 -0.018 -0.005
  The Difference in Indirect relationship across Two Age Groups
  Estimated difference SE 95% LLCI 95% ULCI
  (Age ≥ 70)—(Age < 70) -0.0111** 0.0042 -0.0203 -0.0037
  1. Abbreviations: SE Standard errors, t is t-statistics and p is the corresponding p-value
  2. aDummy variable indicating group: 1 = Men; 2 = Currently married with a living spouse; 3 = Meet friends at least once a month; 4 = have a good health status; 5 = Exercise regularly
  3. bLogarithm of family income is used in the estimation model
  4. Standard errors are bootstrapped using 5,000 bootstrap replications
  5. ** p < 0.05; * p < 0.10