Women who smoke during pregnancy are more likely to be referred to an obstetrician during pregnancy and birth: results from a cohort study

Table 2 Initation and frequency of antenatal consultations with the midwife by smoking behavior during pregnancy

	Total N = 41 088	Non-smokers n = 34 102	Early stoppers n = 3217	Late- or non-stoppers n = 3769	p-value
	Median (Interquartile Range)	Median (IQR)	Median (IQR)	Median (IQR)
Initatition of maternal healthcare (in weeks of gestation)	9.4 (8.1–11.0)	9.4 (8.1–11.0)	9.1 (8.0–10.7)	9.4 (8.0–11.2)	≤ 0.001
Number of antenatal face-to-face visits (regular consultations in person)	12.0 (9.0–14.0)	12.0 (9.0–14.0)	12.0 (9.0–14.0)	12.0 (8.0–14.0)	≤ 0.001
Number of contact moments via telephone	2.0 (0.0–4.0)	2.0 (0.0–3.0)	2.0 (0.0–4.0)	2.0 (0.0–4.0)	≤ 0.001

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