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Table 1 Sample size (countries) and year of data used for analysis for all outcomes and distribution of income level of countries by outcome

From: Education and micronutrient deficiencies: an ecological study exploring interactions between women’s schooling and children’s micronutrient status

  Years used to assess current relationship Years used to assess relationship over time Income level of countries included in analysis for current relationship [%(n)]
  Numbera Educational attainment Outcome and GNI per capita Numberb Educational attainment Outcome and GNI per capita Low Lower middle Upper middle High
Outcome
 Anemia among < 5 y 141 2010 2012 659 1985–2005 1990–2010 16.3 (23) 24.1 (34) 23.4 (33) 36.2 (51)
 Anemia among non-pregnant women 141 2010 2012 659 1985–2005 1990–2010 16.3 (23) 24.1 (34) 23.4 (33) 36.2 (51)
 VAD among < 5 y 93 2010 2013 365 1990–2005 1995–2010 23.7 (22) 32.2 (30) 34.4 (32) 9.7 (9)
 Zinc deficiency in the population 139 2000 2005 515 1985–2000 1990–2005 25.2 (35) 25.9 (36) 20.1 (28) 28.8 (40)
 Median UIE of the population 127 2010 2012 17.3 (22) 26.0 (33) 22.8 (29) 33.9 (43)
 Infants protected from iodine deficiency 94 2010 2012 23.4 (22) 36.2 (34) 34.0 (32) 6.4 (6)
  1. a Number of countries
  2. b Number of country time points over the observation periods
  3. GNI gross national income, VAD vitamin A deficiency, UIE urinary iodine excretion, y years