Table 2.

4×4 Comparison of Agreement Between and Within qPCR and SPC in Detecting S. mutans

SPC
		00*	01	10	11	Total
Frequency	00	8	1	0	3	12
Row Percent		66.67	8.33	0.00	25.00	1.7 (% of Total)
	01	20	0	1	2	23
		86.96	0.00	4.35	8.70	3.2
qPCR	10	17	1	1	7	26
		65.38	3.85	3.85	26.92	3.7
	11	231	20	31	367	649
		35.59	3.08	4.78	56.55	91.4
	Total	276	22	33	379	710
		38.9	3.1	4.6	53.4	100.0

^*Row and column definitions: 00 = both samples detect no S. mutans 01 = first sample detect no S. mutans, second sample detect S. mutans 10 = first sample detect S. mutans, second sample detect no S. mutans 11 = both samples detect S. mutans