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Table 1 Gender and age distributions of all subjects prior to matching, and those of the unmatched and matched subjects

From: Serum electrolyte levels in relation to macrovascular complications in Chinese patients with diabetes mellitus

  NGR (Group I) IGR (Group II) DM (Group III)
Before matching    
n (men/women) 1768 (623/1145) 524 (184/340) 431 (182/249)
Age (years) 52.6 ± 11.5 57.2 ± 10.2 60.0 ± 9.2
Unmatched    
n (men/women) 598 (165/433) 135 (31/104) 88 (35/53)
Age (years) 43.8 ± 11.1 56.5 ± 12.8 67.2 ± 7.4
Matched    
n (men/women) 1170 (458/712) 389 (153/236) 343 (147/196)
Age (years) 57.1 ± 8.7 57.5 ± 9.1 58.1 ± 8.6
  1. Descriptive values are expressed as the frequency or mean ± standard deviation.