Table 2.

Clustering of health-compromising behaviours in pregnant women at 1^st trimester of pregnancy (baseline) and during pregnancy (follow-up)

	Baseline (N=1057)
N Health-compromising behaviours	Smoking	Alcohol consumption	Inadequate diet		Observed prevalence (%)	Expected prevalence (%)	Ratio O/E	95 % CI
0	-	-	-		35.11	34.25	1.03	0.94;1.12
1	+	-	-		7.35	7.93	0.93	0.75;1.11
1	-	+	-		1.78	2.86	0.62	0.39;0.90
1	-	-	+		41.80	40.65	1.03	0.95;1.12
				Total	50.93	51.44	1.00	0.94;1.09
2	+	+	-		1.43	0.66	2.08*	1.29;3.18
2	+	-	+		7.93	9.42	0.84	0.69;1.00
2	-	+	+		2.36	3.40	0.71	0.49;0.99
				Total	11.72	13.48	1.15	0.99;1.33
3	+	+	+		2.14	0.79	2.48*	1.67;3.54
	Follow-up (N=1046)
0	-	-	-		58.67	56.08	1.05	0.97;1.12
1	+	-	-		5.06	7.22	0.70	0.54;0.90
1	-	+	-		4.05	7.21	0.56	0.42;0.73
1	-	-	+		23.66	23.92	0.99	0.88;1.11
				Total	32.77	38.35	0.86	0.78;0.94
2	+	+	-		2.10	0.78	2.67*	1.76;3.89
2	+	-	+		2.88	3.08	0.92	0.65;1.27
2	-	+	+		2.18	2.57	0.85	0.56;1.22
				Total	7.16	6.43	1.11	0.89;1.36
3	+	+	+		1.40	0.33	4.39*	2.60;6.94

+: health-compromising behaviours present; − : health-compromising behaviours absent; CI = Confidence Interval; * p < 0.05