Incidence of myopia and biometric characteristics of premyopic eyes among Chinese children and adolescents

BMC Ophthalmology

Table 2 Progression rates of myopia among grade 1 and 7 students

	N	Progression rate		% with change> − 1.0 D			% with change> − 2.0 D
		Mean	95% CI	N	%	95% CI	N	%	95% CI
Grade 1 students
With myopia	51	−0.97	− 1.22,-0.71	23	41.8	28.4, 55.3	7	12.7	3.6, 21.8
Boys	26	−1.01	− 1.33,-0.68	12	46.2	25.9, 66.7	4	15.4	0.5, 30.2
Girls	25	−0.93	−1.34,-0.51	11	37.9	19.1, 56.7	3	10.3	0.0, 22.1
P		0.76			0.54			0.58
Without myopia	2259	−1.29	−1.33, − 1.19	1340	56.4	54.4, 58.4	379	15.9	14.5, 17.4
Boys	1253	−1.23	− 1.28, − 1.18	714	54.2	51.5, 56.9	190	14.4	12.5, 16.3
Girls	1006	−1.36	− 1.42, − 1.29	626	59.1	56.1, 62.0	189	17.8	15.5, 20.1
P		0.002			0.02			0.02
With myopia
-0.5~ − 1.0 D	34	−0.97	−1.24,-0.69	18	50.0	32.8, 67.2	4	11.1	0.3, 21.9
< −1.0 D	17	−0.96	−1.55,-0.38	5	26.3	4.5, 48.1	3	15.8	0.0, 33.9
P		0.99			0.09			0.62
Grade 7 students
With myopia	646	−1.02	−1.07, −0.96	315	45.5	41.7, 49.2	42	6.1	4.3, 7.8
Boys	249	−1.02	−1.12, −0.93	117	42.4	36.8, 48.3	18	6.5	3.6, 9.5
Girls	397	−1.01	−1.08, −0.95	198	47.5	42.7, 52.3	24	5.8	3.5, 8.0
P		0.87			0.19			0.68
Without myopia	1545	−1.20	−1.25, −1.16	1014	65.6	63.3, 68.0	163	10.6	9.0, 12.1
Boys	866	−1.17	−1.22, − 1.12	562	64.9	61.7, 68.1	83	9.6	7.6, 11.6
Girls	679	−1.25	−1.31, − 1.18	452	66.6	63.0, 70.1	80	11.8	9.4, 14.2
P		0.08			0.49			0.16
With myopia
-0.5~ − 1.0 D	175	−0.97	−1.09, −0.85	97	55.4	48.0, 62.9	11	6.3	2.7, 9.9
-1.01~ − 2.0 D	229	−0.95	−1.07, − 0.83	109	47.6	41.1, 54.1	15	6.6	3.3, 9.8
< −2.0 D	242	−0.92	−1.08, − 0.77	109	45.0	38.7, 51.4	16	6.6	3.5, 9.8
P		0.93			0.10			0.99

ISSN: 1471-2415