The main factors that affect index are average gross nation product and the gross enrolment ratio in institutions of common higher education.

影响该指标的主要因素有人均国民产值和高等学校毛入学率。

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In sub-Saharan Africa, the gross enrolment ratio for girls in lower secondary education is 39% compared to 48% for boys.

UNESCO: World Water Assessment Programme (WWAP)

About 35 million girls were enrolled in lower secondary education in 2009, with the female gross enrolment ratio reaching 69% compared to 53% in 1999.

UNESCO: EDUCATION

Significant improvements have also been made in the Arab States, with the female gross enrolment ratio for lower secondary education rising from 67% to 82% over the same period.

UNESCO: World Water Assessment Programme (WWAP)