Table 3.

Mean, Standard Deviation, and Difference Between Salivary Cotinine Levels at Baseline and End of Pregnancy by Smoking Change Category

Smoking change category	n	Baseline	EOP	Difference
Heavy/heavy	74	269±111	248±81	−21*
Light/heavy	22	80±47	248±91	+168*
Light/light	73	80±42	76±39	−4*
Heavy/light	20	244±78	94±30	−150
Quita	36	94±77	9 ± .8	−85

Note. ^aReferent group.

^*Statistically significant at p < .005.