Table 1

Description of the National Health and Nutrition Examination Survey data set used for the study

Diagnostic category

Definition

N

Classification Scheme I

Classification Scheme II


Diagnosed diabetes

Answered "yes" to question "Have you ever been told by a doctor or health professionals that you had diabetes?"

1,266

Cases

Excluded from analysis


Undiagnosed diabetes

Answered "no" to question "Have you ever been told by a doctor or health professionals that you had diabetes?"

AND

Fasting plasma glucose level ≥ 126 mg/dl

195

Cases

Cases


Pre-diabetes

Fasting plasma glucose level 100-125 mg/dl

1,576

Non-cases

Cases


No diabetes

Fasting plasma glucose level <100 mg/dl

3,277

Non-cases

Non-cases


Notes: Total number of the cases for classification scheme I = 1461

Total number of the non-cases for classification scheme I = 4853

Total number of the cases for classification scheme II = 1709

Total number of the non-cases for classification scheme II = 3206

Yu et al. BMC Medical Informatics and Decision Making 2010 10:16   doi:10.1186/1472-6947-10-16

Open Data