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Table 1 The proportion of girls having had and not having had their first period, distributed by grade

From: Explaining differential item functioning focusing on the crucial role of external information – an example from the measurement of adolescent mental health

 

Grade 5

Grade 7

Grade 9

n = 3174

n = 2929

n = 3168

Girls period

10.9%

70.7%

97.6%

Girls no period

89.1%

29.3%

2.4%

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BMC Medical Research Methodology

ISSN: 1471-2288

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