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Table 1 Comparison of baseline characteristics between 457 resident and 313 migrant children who completed 2-year follow-up

From: Different patterns of myopia prevalence and progression between internal migrant and local resident school children in Shanghai, China: a 2-year cohort study

  

Resident n = 457

Migrant n = 313

Chi-square/t value

P Value

Grade, No (%)

1

227 (49.7)

159 (50.8)

0.0944

0.7587

 

2

230 (50.3)

154 (49.2)

  

Gender, No (%)

male

233 (51.0)

184 (58.8)

4.5538

0.0328

 

female

224 (49.0)

129 (41.2)

  

Age, years (SD)

 

7.54 (0.75)

7.89 (0.88)

5.926

< 0.0001

Parental Myopia, No (%)

0

123 (26.9)

201 (64.2)

107.9569

< 0.0001

 

> = 1

87 (19.0)

21 (6.7)

  
 

unknown

247 (54.1)

91 (29.1)

  

Prevalence of Myopia, No (%)

 

51 (11.2)

25 (8.0)

2.1018

0.1471

SE, Mean (95% CI), D

 

0.59 (0.50–0.68)

0.46 (0.35–0.57)

1.89

0.0588

AL, Mean (95% CI), mm

 

22.97 (22.90–23.04)

22.94 (22.85–23.02)

0.62

0.5352

  1. SE spherical equivalent refraction, AL axial length