Postprandial C-peptide is more relevant to hemoglobin A1c levels and diabetic microvascular complications than fasting C-peptide in type 2 diabetes

Table 2 Partial correlation between C-peptide and hemoglobin A1c

	r value	95%CI	P value
FCP	-0.168	-0.249 to -0.075	< 0.001
2hCP	-0.423	-0.480 to -0.362	< 0.001
Delta CP	-0.445	-0.503 to -0.388	< 0.001
CP ratio	-0.057	-0.309 to -0.008	0.23
FCP/ fasting plasma glucose	-0.346	-0.415 to -0.273	< 0.001
2hCP/postprandial blood glucose	-0.485	-0.551 to -0.414	< 0.001
Delta CP/BG	-0.428	-0.501 to -0.351	< 0.001
CP/BG ratio	-0.058	-0.320 to -0.048	0.222

BG: Blood glucose; CP: C-peptide; FCP: Fasting C-peptide; 2hCP: 2 hours postprandial C-peptide.