Table 2

Evidence Project risk of bias assessment7 for studies included in the effectiveness review

Study	Study design includes pre/post intervention data	Study design includes control or comparison group	Study design includes cohort	Comparison groups equivalent at baseline on sociodemographics	Comparison groups equivalent at baseline on outcome measures	Participants randomly selected for assessment	Participants randomly allocated to the intervention	Control for potential confounders	Follow-up rate>=75%
2006–2008 The Border Contraceptive Access Study10 12 13	No	Yes	Yes	No	Yes	No	No	Yes	Yes
2000 Mexican National Health Survey analysis14	No	Yes	No	No	N/A	Yes*	No	Yes	N/A
1979 Mexico National Fertility and Mortality Study9	No	Yes	No	NR†	N/A	Yes	No	No	N/A
1974 Colombian Fertility and Contraceptive Use Survey11	No	Yes	No	NR†	N/A	Yes‡	No	No	N/A

*Four-stage probability proportionate to size sampling.
†Authors state that the comparison groups were similar, but no comparative data provided to assess this.
‡Three-stage probability sampling.
N/A, not applicable; NR, not reported.