Total number of female students in the theoretical age group for lower secondary education enrolled in that level, expressed as a percentage of the total female population in that age group. Divide the number of female students enrolled who are of the official age group for lower secondary education by the female population for the same age group and multiply the result by 100. NER at each level of education should be based on enrolment of the relevant age group in all types of schools and education institutions, including public, private and all other institutions that provide organized educational programmes.