Table 2. The calculation of EBV DNA concentration (EBNA-1) by qPCR in saliva of NPC patients before and after undergoing therapy.

NPRN	Calculation of concentration of EBV DNA (ng/mL)
	Before therapy	After therapy
13	0.000045	0.000026
16	0.000097	0.000090
18	0.000050	0.000062
19	0.001780	0.000065
20	0.000064	0.000067
21	0.001190	0.000063
22	0.000150	0.000003
23	0.001060	0.000158
27	0.000088	0.000592
29	0.000109	0.000025
30	0.000275	0.000025
31	0.000121	0.000877
33	0.000130	0.000061
40	0.000085	0.000054
41	0.000388	0.000045
42	0.000120	0.000005
43	0.000122	0.000104
45	0.000183	0.000035
48	0.000121	0.000905
52	0.000105	0.000039
54	0.000090	0.000293
55	0.000081	0.000069
59	0.000080	0.000774
61	0.001010	0.000029
Average	0.00031	0.00018
SD	0.00045	0.00028
SEM	0.00009	0.00006

Note: NPRN (NPC patient registration number)