Article for reference: Physical activity and the prevention of depression: A cohort study

https://www.sciencedirect.com/science/article/abs/pii/S0163834319301641

Questions:

(1) Bias/Confounding? Were there any biases that might affect the results and their interpretation? E.g., recall, selection, social desirability Direction/magnitude? Non-differential/differential misclassification? How was confounding addressed? Could they have missed any important confounders? Residual confounding?

(2) Results? What were the major results of the study? What measure of association is used? (PR, RR, OR, AR, etc.) Were these measures and choices appropriate for the aim? Do the calculations make sense?

(3) Discussion? Are the findings important? Are the conclusions logical and supported by the findings? Are the results generalizable to other populations? How do these findings fit into the larger literature? Do they show similar or contrary findings to previous studies? How is interpretation affected by misclassification (particularly nondifferential... why?) How did the authors describe and address any limitations?