Table 2.

Comparison and Correlation of Ct Values between the Different Samples.

Sample	N	Range of Ct Values of E Gene	Median	Mean ± Standard Deviation	P Value	Correlation Coefficient
NPS	21	12.10–34.80	19	21.03 ± 5.73	0.001a	0.441 (moderate positive linear relationship; P 0.045a)
GCF	21	21.53–36.85	27.39	27.21 ± 3.91
GCF	18	12.00–36.85	27.32	26.63 ± 5.46	0.658	0.674 (moderate positive linear relationship; P 0.002a)
Saliva	18	13.00–35.02	26.46	26.09 ± 5.42
NPS	20	12.10–34.80	20.4	21.55 ± 5.84	0.001a	0.561 (moderate positive linear relationship; P 0.010a)
Saliva	20	17.23–38.34	27.05	28.28 ± 5.42

Ct value, cycle threshold value; GCF, gingival crevicular fluid; N, number of positive samples common to both groups; NPS, nasopharyngeal swab.

^aStatistically significant.