Table 1. Characteristics and methodologies of the included studies.

	Number of studies	Study reference numbers
Year of publication
2010 or after	33	[25–57]
Before 2010	8	[17–24]
Study design
Cross-sectional	32	[17–20,22,24–28,31–37,41–48,50–56]
Cohort	9	[21,23,29,30,38–40,49,57]
What is measured? (outcomes)
Preference	21
Pregnant women n = 19		[20–22,24,29,30,37–41,44,48,49,52,53,55–57]
Non-pregnant women n = 2		[42,54]
CDMR	22	[17–19,23,25–28,30–36,39,43,45–47,50,51]
Source
Self-administered questionnaire	18	[20–22,24,30,37,39–42,44,47,48,52–56]
Medical record-based questionnaire	14	[18,19,27,28,31–35,43,45,46,50,51]
Interviewer-based questionnaire	6	[23,25,29,38,49,57]
Data extracted from a national database	3	[17,26,36]
Sample size
More than 100 000 women	8	[17,26,28,32–34,36,46]
10 000–100 000 women	7	[18,31,35,39,43,50,51]
1 000–9 999 women	9	[19,23,25,27,40,42,44,45,49]
500–999 women	5	[30,47,52,55,56]
100–499 women	12	[20–22,24,29,37,38,41,48,53,54,57]
Less than 100 women	0