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Table 3 The extracted glycated hemoglobin and extracted glycated albumin data obtained in the retrospective cohort study

From: Changes in antidiabetic prescription patterns and indicators of diabetic control among 200,000 patients over 13 years at a single institution in Japan

Year 2001 2005 2010 2013 rs* p value*
Evaluated HbA1c (NGSP) (n) 170 170 170 170   
HbA1c (NGSP)a (%) 8.2 ± 0.9 8.0 ± 0.9 7.9 ± 1.0 7.7 ± 1.1 −0.22 <0.01
HbA1c (IFCC)a (mmol/mol) 67 ± 10 64 ± 9 63 ± 11 60 ± 12   
HbA1c (NGSP) groupb
 <6% (%) 0 (0.0) 0 (0.0) 1 (1) 1 (1)   
 ≥6% and <7% (%) 14 (8) 15 (9) 21 (12) 45 (27)   
 ≥7% and <8% (%) 51 (30) 73 (43) 79 (47) 72 (42)   
 ≥8% (%) 105 (62) 82 (48) 69 (41) 52 (31)   <0.01#
  1. Mean ± standard deviation or n (%)
  2. NGSP national glygohemoglobin standardization program; IFCC the international federation of clinical chemistry and laboratory medicine
  3. * Analysis results over 13 years; Additional file 3 shows this in detail
  4. # Using the Chi square test
  5. aYearly mean value for each patient
  6. bPercentages in this column may not add up to exactly 100% because of rounding up
Year 2003 2005 2010 2013 rs* p value*
Evaluated glycated albumin (n) 136 170 170 168   
Glycated albumina (%) 23.5 ± 3.6 22.8 ± 3.5 22.3 ± 3.9 21.5 ± 4.4 −0.14 <0.01
Glycated albumin quartileb
 <19.7% (%) 20 (15) 28 (17) 45 (27) 59 (35)   
 ≥19.7% and <22.0% (%) 27 (20) 52 (31) 45 (27) 47 (28)   
 ≥22.0% and <24.6% (%) 42 (31) 40 (24) 43 (25) 26 (16)   
 ≥24.6% (%) 47 (35) 50 (29) 37 (22) 36 (21)   <0.01#
  1. Mean ± standard deviation or n (%)
  2. NGSP national glygohemoglobin standardization program; IFCC the international federation of clinical chemistry and laboratory medicine
  3. * Analysis results over 13 years; Additional file 3 shows this in detail
  4. # Using the Chi square test
  5. aYearly mean value for each patient
  6. bPercentages in this column may not add up to exactly 100% because of rounding up