Age-Related Change of Axial Length, Spherical Equivalent, and Prevalence of Myopia and High Myopia in School-Age Children in Shanghai: 2014–2018

Table 1

Characteristics for each age group in 2014 and 2018.

	Age (years)	2014		2018
		N	Girls (%)	N	Girls (%)
Primary school	7	250	132 (52.8)	428	202 (47.2)
	8	271	135 (49.8)	451	207 (45.9)
	9	256	119 (46.5)	380	178 (46.8)
	10	252	115 (45.6)	275	136 (49.5)
	11	247	110 (44.5)	264	135 (51.1)
	Total	1276	611 (47.9)	1798	858 (47.7)
Junior high school	12	233	114 (48.9)	315	152 (48.3)
	13	230	109 (47.4)	251	122 (48.6)
	14	189	81 (42.9)	169	76 (45.0)
	15	175	63 (36.0)	149	62 (41.6)
	Total	827	367 (44.4)	884	412 (46.6)
Senior high school	16	299	158 (52.8)	338	194 (57.4)
	17	328	173 (52.7)	343	189 (55.1)
	18	327	169 (51.7)	295	164 (55.6)
	Total	954	500 (52.4)	976	547 (56.0)