When high hopes meet low action: identifying the "Ambitious Procrastinator" profile in the physical activity intention-behavior gap and its mental health toll.

To ensure the standard errors were not biased by the “classify-analyze” approach, the sensitivity analysis using the 3-step BCH approach in Mplus corroborated these findings, demonstrating that the structural relationship between the “Ambitious Procrastinator” latent class and worsened T2 mental health trajectories remained highly significant (all p < 0.01 ), firmly establishing the robustness of our results.

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