Table 2.

Percent agreement among the smoking metrics ^*

	Pregnancy complications due to tobacco use during pregnancy, 1989-2005	Self-reported smoking, 2007+	Cotinine present	Hydroxycotinine	Total (%)
Pregnancy complications due to tobacco use during pregnancy, 1989-2005	100%	---	65%	55%	20 (2.1%)
Self-reported smoking, 2007+	---	100%	78%	56%	9 (4.3%)
Cotinine			100%	63%	102 (7.3%)
Hydroxycotinine				100%	195 (14.0%)
Total (smoking rate indicated by this measure)	20 (2.1%)	9 (4.3%)	102 (7.3%)	195 (14.0%)	240

^*Metrics listed in each row are the reference when calculating the percentage of agreement