“… 4 , 5 , 8 – 11 , 13 – 16 , 19 – 24 , 27 , 30 , 31 , 33 , 37 – 43 , 48 – 50 , 52 – 57 , 60 – 62 , 65 , 67 – 70 , 72 , 73 The level of detail was variable and depended to some extent on the reporting nation; one study broke down education into 5 groups (6–9 years, 9–11 years, high school graduates, some college or vocational school, and college graduates), 70 to sole passage of a graduation exam. 33 In 3 trials, only maternal education was reported 12 , 65 , 67 and one study solely enrolled medical students. 72 …”