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Table 3 Multivariable linear model for diabetes-specific quality of life

From: Vitamin D deficiency is associated with poorer satisfaction with diabetes-related treatment and quality of life in patients with type 2 diabetes: a cross-sectional study

Coefficient Estimate SE p-value
Intercept −0.214 0.171 0.218
Vitamin D deficiencyb −0.283 0.104 0.007
Diabetes duration (years) −0.041 0.039 0.297
Diabetes duration-squared (years2) 0.002 0.002 0.271
Retinopathy 0.299 0.346 0.389
Insulin 1.409 0.793 0.077
Retinopathya insulin −2.771 0.918 0.003
Diabetes durationa insulin −0.588 0.234 0.013
Diabetes duration-squareda insulin 0.033 0.014 0.022
Diabetes durationa retinopathy −0.112 0.079 0.161
Diabetes duration-squareda retinopathy 0.003 0.004 0.428
Diabetes durationa retinopathya insulin 0.743 0.247 0.003
Diabetes duration-squareda retinopathya insulin −0.038 0.015 0.011
  1. Multiple R-squared: 24.97%. adenotes the existence of interactions between the variables. bVitamin D deficiency is defined as levels of 25(OH) D below 15 ng/mL (37.4 nmol/L)