Table 2.

Univariate and multiple linear regression analyses (n = 77) to assess the impact of the following covariables on SAF: age; diabetes duration; gender; current HbA1c (current value, and HbA1c-above-target/ HbA1c-within-target); and historical HbA1c (historical value, and HbA1c-above-target/ HbA1c-within-target)

	Beta coefficient	95 % CI	P-value	Adjusted R2
Univariate analysis
Age (years)	0.047	0.026, 0.067	<0.001	0.207
Duration of diabetes (years)	0.025	0.013, 0.038	<0.001	0.172
Sex (male/female)	0.047	−0.056, 0.150	0.366	−0.002
Current HbA1c (%)	0.056	0.019, 0.092	0.003	0.097
Historical HbA1c (%) (n = 73)	0.057	0.003, 0.111	0.040	0.045
Current HbA1c: HbA1c-above-target vs. Hba1c-within-target	0.034	−0.104, 0.172	0.628	−0.010
Historical HbA1c: HbA1c-above-target vs. Hba1c-within-target (n = 73)	0.028	−0.092, 0.147	0.645	−0.011
Multiple linear regression analysis
Model 1 (n = 77)				0.265
Age (years)	0.040	0.019, 0.061	<0.001
Diabetes duration 4 to <10 years vs. ≤ 4 years	0.065	−0.044, 0.172	0.239
Diabetes duration ≥10 years vs. ≤ 4 years	0.187	0.053, 0.320	0.007
Model 2 (n = 73)				0.235
Age (years)	0.043	0.022, 0.065	<0.001
Diabetes duration 4 to <10 years vs. ≤ 4 years	0.056	−0.064, 0.175	0.356
Diabetes duration ≥10 years vs. ≤ 4 years	0.179	0.030, 0.328	0.019
Current HbA1c: HbA1c-above-target vs. Hba1c-within-target	0.012	−0.138, 0.162	0.872
Historical HbA1c: HbA1c-above-target vs. Hba1c-within-target	−0.048	−0.172, 0.077	0.446

HbA1c-above-target: > 7.5 %/59 mmol/mol; Hba1c-within-target HbA1c: ≤ 7.5 %/59 mmol/mol