a significant trendP < 0.001
A Cochran-Armitage trend test across four ordered categories (no cough, mild, moderate, and severe cough) showed a significant trend toward lower cough severity in the tegileridine group (Z = 4.11, P < 0.001).
A Cochran-Armitage trend test across four ordered categories (no cough, mild, moderate, and severe cough) showed a significant trend toward lower cough severity in the tegileridine group (Z = 4.11, P < 0.001).