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ssss1 Stratified quota sampling design for semistructured interviews on experiences of racism among African Americans in Tallahassee, FL

Age 25–34 Age 35–54 Age 55–65 Dark Light Dark Light Dark Light Total Men Low SES 2 2 2 2 2 2 12 High SES 2 2 2 2 2 2 12 Women Low SES 2 2 2 2 2 2 12 High SES 2 2 2 2 2 2 12 Total 8 8 8 8 8 8 48

Guest and colleagues (2006) stimulated an explosion of research on the meaning and measurement of saturation. In subsequent work, they extended the question to focus groups (Guest et al. 2017; see also Hennink et al. 2019) and recently proposed a simple measure for reporting on saturation (Guest et al. 2020). Others have produced their own estimates of minimum sample size (Francis et al. 2010), examined different conceptual dimensions of saturation (Hennink et al. 2016; Weller et al. 2018), developed statistical approaches for estimating saturation (Galvin 2015), and questioned whether saturation is the right criterion at all (Braun and Clarke 2021; Leese et al. 2021; Sebele-Mpofu 2020). Work in this area is certain to continue in coming years.