Table 5.

Participant demographics and measurement characteristics

	Number of studies
Gender distribution (n = 34)
Boys/Girls in roughly equal proportion	15
Boys only	1
Not stated	18
With/without myopia (n = 29)
With and without myopia	21
With myopia only	4
Without myopia only	1
Not stated	3
Duration of study participation for individual participants (n = 34)
1 week or less	8
More than 1 week, up to a month	6
More than 1 month, up to one year	12
More than one year, up to 3 years	6
More than 3 years	2
Duration of daily measurements (n = 34)
From 1 to less than 6 h	1
From 6 to less than 14 h	5
More than 14 h, up to "continuous"	11
"Daylight hours"	1
Not applicable	16