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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