Table 4.

Presence of clue cells in relation to Nugent's scoring system and Hay's classification system.

	n	Clue cells		P value Odds ratio
		Positive	Negative
Nugent's score
7–10	70	49	21	<0.001
4–6	36	2	34	164.5
0–3	107	0	107
Hay's score
III	87	50	37	<0.001
II	23	1	22	168.9
I	103	0	103