Intersectional predicted probabilities and corresponding confidence intervals in S1A-S1C Tables were obtained from Model 3, a multilevel regression analysis wherein the level-1 units were the individual respondents, and the level-2 units were intersections.

This model was fully adjusted for the individual dimensions used to construct the intersections (i.e., gender, age, immigration status, race, income). Age categories were defined as young adult (18–39 years), middle-aged adult (40–59 years), and older adult (60+ years). Immigration status categories were defined as recent immigrant (0–9 years) and established immigrant (10–121 years). Income categories were defined as low (bottom 30%), middle (middle 40%), high (upper 30%). S1A Table provides a complete list of intersection descriptions, ranked from lowest to highest predicted probability of having a primary care provider. S1B and S1C Tables provide a list of intersections with predicted probabilities that fall within the widest and narrowest 10% of confidence intervals, respectively.

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