Of 4,215 eligible male and female migrants screened for eligibility, 1,774 migrants refused to participate and 2,441 agreed to participate. Of these, 1,852 were male (and were excluded from study) and 589 were female. Of the 589 female study participants, 337 arrived in Tijuana from other regions in Mexico (and were excluded from study) and 252 arrived in Tijuana from the United States. Of the 252 women arrived from the United States, 61 were from the deported flow and 191 were from the southbound flow. Of the 61 migrant women from the deported flow, 26 spent 30 days or more in the United States during the previous 12 months and were included in the final analytic sample. Of the 191 migrant women from the southbound flow, 187 participants spent 30 days or more in the United States during the previous 12 months and were included in the final analytic sample. Of the 187 participants, 10 migrant women reported being undocumented during the previous 12 months. The final samples were 36 undocumented migrants and 177 documented migrants.

Figure. Participant recruitment for study on cervical and breast cancer screening among Mexican migrant women, 2013. Data were collected through the project Migrante , which comprised a series of cross-sectional probability surveys of Mexican migrants in Tijuana from 2007 to 2015 (http://migrante.weebly.com).

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