Plasma  C-peptide levels Basal  Post-glucose Post Glucagon
Madurai (in ng/ml)      
Healthy controls   4.40 (1.68)  
Type 1 DM   0.73 (0.44)  
Type 2 DM-Lean   2.66 (0.55)  
Obese Type 2 DM   3.73 (1.34)  
Cuttack Cuttack (in ng/ml)      
Type 2 DM-Lean 1.5 (0.50) 2.14 (0.60) 2.44 (0.79)
Obese Type 2 DM 1.6 (0.60) 2.08 (0.60) 2.55 (0.77)
Madras (Chennai) (in pmol/ml)      
Type 2 DM-Lean 0.74 (0.52) 1.51 (0.89)  
Obese Type 2 DM 0.88 (0.51) 1.88 (0.72)  
Type 1 DM 0.9 (0.10) 0.14 (0.08)  
Calcutta (Kolkata) (in ng/ml)      
Type 2 DM-Lean 2.16 ± 0.48 2.96 ± 0.92 37%
Non-obese Type 2 DM 3.12 ± 0.55 3.68 ± 0.86 10%
Obese Type 2 DM 3.76 ± 1.28 3.98 ± 0.48 6%
Table 3: Plasma levels of C-Peptide in Lean and obese Type 2 DM at basal and post-stimulated state: mean (± SD) [1,5].