What do systematic reviews say?

HDI (quantitative) vs Populations in countries with a higher Human Development Index (very high, HDI >=0.800)

Pooled caries experience (DMFT) was similar in very-high-HDI and high-HDI countries, and meta-regression found no significant association between national HDI and DMFT; ungraded observational evidence with very high heterogeneity.

• Socioeconomic Factors and Caries in People between 19 and 60 Years of Age: An Update of a Systematic Review and… 2018 All outcomes

  Population/community-based studies of adults aged 19-60 years across multiple countries (studies published 1975-2016) · Adjusted (Model 1)
  Meta-regression coefficient -42.94101
  Studies not reported
  GRADE not reported
• Socioeconomic Factors and Caries in People between 19 and 60 Years of Age: An Update of a Systematic Review and… 2018 All outcomes

  Population/community-based studies of adults aged 19-60 years across multiple countries (studies published 1975-2016) · Unadjusted model
  Meta-regression coefficient 20.17878
  Studies not reported
  GRADE not reported
• Socioeconomic Factors and Caries in People between 19 and 60 Years of Age: An Update of a Systematic Review and… 2018 All outcomes

  Population/community-based studies of adults aged 19-60 years across multiple countries (studies published 1975-2016) · Adjusted (Model 2)
  Meta-regression coefficient 6.901906
  Studies not reported
  GRADE not reported