Table 2.

Prevalence of smoking during pregnancy (SDP) in two-parent and single-mother families by predicted probability of single motherhood: European ancestry families

Variable		Predicted probability of single motherhood SDP, n (%)
	Block 1 (very low)		Block 2 (low)		Block 3 (low intermediate)
	Two parent (n = 724)	Single mother (n = 9)	Two parent (n = 179)	Single mother (n = 4)	Two parent (n = 170)	Single mother (n = 13)
First trimester	151 (21)	4 (44)	45 (25)	3 (75)†	41 (24)	6 (46)†
Beyond first trimester	119 (16)	4 (44)*	35 (20)	3 (75)*	29 (17)	6 (46)*
	Block 4 (high intermediate)		Block 5 (high)		Block 6 (very high)
	Two parent	Single mother	Two parent	Single mother	Two parent	Single mother
	(n = 170)	(n =13)	(n = 81)	(n =11)	(n = 70)	(n = 22)
First trimester	51 (30)	6 (46)	38 (47)	6 (55)	31 (44)	9 (41)
Beyond first trimester	44 (26)	6 (46)†	27 (33)	5 (45)	26 (37)	8 (36)

Note: Within-block, single mother > two parent,

^*p < .05,

^†p < .10.