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Table 1 Baseline characteristics of the study population

From: HbA1c versus oral glucose tolerance test as a method to diagnose diabetes mellitus in vascular surgery patients

Characteristics OGTT
  All Normo- Intermediate Diabetes P-
patients glycaemia hyperglycaemia mellitus valuea
Total 275 152 90 33  
Age, mean years 69.5 68.0 71.5 71.1 0.01
range] [35-89] [35-87] [48-89] [59-88]  
Sex, n (%)      0.02
Female 74 (26.9) 51 (33.6) 15 (16.7) 8 (24.2)  
Male 201 (73.1) 101 (66.5) 75 (83.3) 25 (75.8)  
Smoking status, n (%)      0.06
Non-smoker 42 (15.3) 23 (15.1) 10 (11.1) 9 (27.3)  
Former/current smoker 221 (80.4) 123 (80.9) 77 (85.6) 21 (63.6)  
Missing 12 (4.36) 6 (3.95) 3 (3.33) 3 (9.09)  
Renal function, n (%)      0.04
Normal (eGFR > 60) 201 (73.1) 120 (79.0) 57 (63.3) 24 (72.7)  
Reduced (eGFR < 60) 71 (25.8) 31 (20.4) 31 (34.4) 9 (27.3)  
Missing 3 (1.09) 1 (0.66) 2 (2.22)   
Anemia female, n (%)      
No anemia 61 (82.4) 43 (84.3) 10 (66.7) 8 (100) 0.52b
Female Hb < 11.7 g/dL 6 (8.11) 4 (7.84) 2 (13.3) 0  
Missing 7 (9.46) 4 (7.84) 3 (13.3) 0  
Anemia male, n (%)      
No anemia 163 (81.1) 81 (81.2) 62 (82.7) 19 (76.0) 0.81b
Male Hb < 13.4 g/dL 29 (14.4) 16 (15.8) 9 (12.0) 4 (16.0)  
Missing 9 (4.48) 3 (2.97) 4 (5.33) 2 (8.00)  
Medical history of CAD, n (%)      0.67
No 231 (84.0) 129 (84.9) 73 (81.1) 29 (87.9)  
Yes 42 (15.3) 22 (14.5) 16 (17.8) 4 (12.1)  
Missing 2 (0.73) 1 (0.66) 1 (1.11) 0  
Affected vascular bed, n (%)      0.16
Carotid 43 (15.6) 26 (17.1) 11 (12.2) 6 (18.2)  
Aortic 59 (21.5) 30 (19.7) 23 (25.6) 6 (18.2)  
IOD 50 (18.2) 35 (23.0) 9 (10.0) 6 (18.2)  
Infrainguinal 123 (44.7) 61 (40.1) 47 (52.2) 15 (45.5)  
Fasting glucose, mean mmol/L (SE) 5.70 (0.05) 5.27 (0.04) 5.90 (0.05) 7.11(0.24) <0.001
HbA1c, mean% (SE) 6.1 (0.03) 6.0 (0.03) 6.1 (0.05) 6.5 (0.13) <0.001
  1. a Chi-square test for categorical data and Wald-test for continuous data.
  2. b Fisher’s exact test.