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Table 4 Multivariate analyses for the factors associated with spherical equivalent (N = 4804)

From: Prevalence of myopia and vision impairment in school students in Eastern China

Demographics

N

Mean Spherical equivalent in diopter (SE)

P-value

Grade

  

< 0.0001

 Kindergarten

381

0.03 (0.11)

 

 Grade 1

331

−0.23 (0.12)

 

 Grade 2

366

−0.54 (0.11)

 

 Grade 3

371

− 0.94 (0.11)

 

 Grade 4

367

−1.39 (0.12)

 

 Grade 5

376

−2.00 (0.11)

 

 Grade 6

368

− 2.32 (0.11)

 

 Grade 7

376

−2.71 (0.12)

 

 Grade 8

360

−3.11 (0.12)

 

 Grade 9

346

−3.52 (0.12)

 

 Grade 10

383

−4.24 (0.10)

 

 Grade 11

373

−4.41 (0.10)

 

 Grade 12

403

−4.31 (0.10)

 

Gender

  

0.02

 Male

2647

−2.22 (0.06)

 

 Female

2154

−2.35 (0.06)

 

School location

  

0.004

 Urban

2691

−2.37 (0.05)

 

 Rural

2110

−2.19 (0.07)

 

School workload

  

< 0.0001

 Low

303

−1.58 (0.13)

 

 Moderate

3841

−2.56 (0.03)

 

 High

657

−2.71 (0.09)

 
  1. Note: R2 = 0.378 from all these risk factors for predicting refractive error, which is higher than the R2 = 0.372 multivariate model using age instead of grade