Table 5.

Univariate association with missing blood sample during follow-up^a

Abbreviations: AD = Alzheimer disease; ADAS-Cog = Alzheimer's Disease Assessment Scale–Cognitive Subscale; ANART = American National Adult Reading Test; CDR = Clinical Dementia Rating; CI = confidence interval; CVD = cardiovascular disease; FAQ = Functional Assessment Questionnaire; GDS = Geriatric Depression Scale; Hcyt = homocysteine; MCI = mild cognitive impairment; MMSE = Mini-Mental State Examination; NA = not applicable; NC = normal cognition; NPI-Q = Neuropsychiatric Inventory Questionnaire.

^aIn logistic regression models, sex: 1 = male; 2 = female; occupation: 1 = professional/managerial; 2 = skilled; 3 = partly skilled/unskilled; gait: 1 = normal; 2 = abnormal. The dependent variable is the indicator (missing = 1; nonmissing = 0) for missing biomarkers. Odds ratios >1 indicate increased probability of missingness for each unit increase of predictors while odds ratios <1 indicate increased probability of remaining in the study for each unit increase of predictors.

^bp < 0.05.

^cStatistical significance remained in a multivariable model.