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Table 1 Description of analytic sample compared with sample of all UN member states: income level and geographic region

From: Is free pre-primary education associated with increased primary school completion? A global study

  Countries in the in primary graduation rate regression (n = 104) All UN member countries (n = 193)
Level of income (%)
 Low 13 18
 Lower-middle 33 29
 Upper-middle 35 27
 High 20 26
Geographic region (%)
 Americas 26 18
 East Asia and Pacific 13 16
 Europe and Central Asia 21 28
 Middle East and North Africa 12 10
 South Asia 4 4
 Sub-Saharan Africa 24 25
  1. All percentages are rounded to the nearest whole number. Some percentages may not always sum exactly to 100% as a result of rounding. National income and regional groupings used are based on 2011 World Bank classifications