Table 2.

Mean DNA copy numbers in 2 µl for each sample type and group as estimated by qPCR

	Serum	Saliva	Subgingival plaque	Placenta	Placenta (PMA treated)
Pre-term (PT) (mean ± standard deviation))	39725 ± 9291ab	7885312 ± 120553	4999338 ± 65321	52825 ± 8812abc	23555 ± 4028c
Pre-term w/pre-eclampsia (PTPE) (mean ± standard deviation))	47671 ± 13092ab	7178412 ± 409932	4585285 ± 55382	43858 ± 7600abc	28703 ± 5192c
Full-term controls (FT) ((mean ± standard deviation))	37509 ± 14029	8072130 ± 187449	3712912 ± 20285	24993 ± 9492	13524 ± 3492

^aStatistically different from saliva (p < 0.05, 2-sample t-test)

^bStatistically different from subgingival plaque (p < 0.05, 2-sample t-test)

^cStatistically different from full-term controls (p < 0.05, 2-sample t-test)