Left vagus nerve magnetic stimulation facilitates nasogastric tube removal in post-stroke patients with dysphagia: a prospective observational cohort study.

Oropharyngeal Secretion Accumulation Scale (Murray Score) Change: The most pronounced heterogeneity was observed in Murray score changes, with highly significant interaction test ( p = 0.006).

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SSA Improvement: The improvement magnitude of SSA across strata ranged from −1.27 to 4.67 points overall, with the second stratum approaching significance ( β = 4.67 [95% CI: −0.11-9.44], p = 0.056).

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The interaction test revealed borderline significant heterogeneity ( p = 0.116), suggesting possible treatment effect variation by propensity score stratification.

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Although unadjusted analysis (HR = 1.645 [0.817–3.314], p = 0.163), multivariable-adjusted analysis (HR = 1.000 [0.039–25.381], p = 0.999), PS-adjusted analysis (HR = 1.892 [0.870–4.115], p = 0.108), and PSM analysis (HR = 1.811 [0.640–5.124], p = 0.263) did not reach statistical significance, the consistency in direction of effect estimates across these methods supported the credibility of the primary finding.

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The Log-rank test did not reach statistical significance ( p = 0.095), indicating that the difference in nasogastric tube removal time between groups was borderline non-significant in unadjusted analysis.

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