Role of Gender in the Prevalence of Myopia among Polish Schoolchildren

Table 2

Spherical equivalent (D) among examined boys and girls.

Age (years)	Boys	Girls
	Mean ± SD	Mean ± SD
6–9 (≥6 and <9)	+0.95 ± 1.04	+0.99 ± 1.21	0.91
9–13 (≥9 and <13)	+0.55 ± 1.23	+0.45 ± 1.05	0.047
13–16 (≥13 and <16)	+0.54 ± 1.08	+0.32 ± 1.14	0.0093

SD: standard deviation. Mann–Whitney test.