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Table 1 Demographic characteristics and comorbid disorders between the keratoconus group and controls

From: Association between chronic kidney disease and the most common corneal ectasia disease (keratoconus): a nationwide cohort study

  Keratoconus
(N = 4609)
Controls
(N = 27,654)
p-value
Age (years), mean ± SD 27.43 ± 13.04 27.57 ± 12.91 0.50
Age group n (%) n (%)  
 12 − 19 years 1271 (27.58) 7563 (23.44) 0.97
 20 − 29 years 1884 (40.88) 11,377 (41.14)  
 30 − 39 years 898 (19.48) 5340 (19.31)  
 ≥ 40 years 556 (12.06) 3374 (12.20)  
Gender
 Male 2508 (54.42) 14,804 (53.53) 0.27
 Female 2101 (45.58) 12,850 (46.47)  
Baseline comorbidity
 Hypertension 148 (3.21) 868 (3.14) 0.79
 Hyperlipidaemia 71 (1.54) 473 (1.71) 0.41
 Diabetes mellitus 63 (1.37) 338 (1.22) 0.41
Follow − up time (years)
Median (IQR) 5.23 (3.52 − 7.46) 5.34 (3.55 − 7.54) 0.08
  1. Note: The demographic characteristics and comorbid disorders between the keratoconus and control groups were compared using Pearson chi-square tests. The median of follow-up time was calculated with Wilcoxon rank sum test
  2. Abbreviations: IQR inter-quartile range, SD standard deviation