CRP and respiratory tract infectious disorder: After univariate analysis, systolic pressure, elevated heart rate, prior upper respiratory infection, fever, neck pain, thyroid tenderness, odynophagia, radiating pain, palpitation, weight loss, firm on palpation, elevated white blood cell, elevated neutrophi, increased ESR, elevated CRP, elevated thyroid hormone level, FT3 to FT4 ratio and suppressed uptake of Technetium-99 m were considered significantly different between the two groups and were selected as covariates in the full multivariable logistic regression model.