Codebook

NIAGADS data set for the Religious Orders Study and Memory and Aging Project.
Rush Alzheimer's Disease Center
Rush University Medical Center

February 6th, 2013

studyid
	description: study of enrollment
	
	value	coding
	  ROS	Religious Orders Study
	  MAP 	Memory and Aging Project

niagadsid
	description: participant's 8-digit randomly assigned identifier

sex
	description: participant's sex

	value	coding
		0	male
		1	female
		
prevad
	description: prevalent Alzheimer's Disease
				 indicator of Alzheimer' Disease diagnosis at study baseline
				
	value	coding
		0	AD not present at study baseline
		1 	AD present at study baseline

incad
	description: incident Alzheimer's Disease
				 indicator of Alzheimer' Disease diagnosis after study baseline

	value	coding
		0	AD not present after study baseline
		1 	AD present after study baseline
		
		
age_onset
	description: age at onset of Alzheimer's Disease diagnosis
		equivalent to age_base (see variable age_base) for participants
		with prevalent Alzheimer's Disease.
		
		Ages >90 are set to 90.
	
age_base
	description: age at study baseline
	
		Ages >90 are set to 90.
	
apoe
	description: apoe genotype
	
	value	coding
		22	E2E2
		23	E2E3
		24	E2E4
		33	E3E3
		34	E3E4
		44	E4E4
	 empty  apeo genotype not available
	
autopsy
	description: autopsy performed
		0	an autopsy has not been performed
		1	an autopsy has been performed
	
braak
	description: semiquantitative measure of neurofibrillary tangles

	value	coding	
		0	0
		1	I	
		2	II
		3	III
		4	IV
		5	V
		6 	VI
		NA	Braak scoring not applicable or not available for this participant
	
race
	description: the self identified race of the participant
	
	value	coding
		1	white
		2	Black, Negro, African-American
		3	Native American, Indian
		4	Eskimo
		5	Aleut
		6	Asian or Pacific Island
		
	
ethnicity
	description: indicates if the participant is of Spanish/Hispanic/Latino origin
	
	value	coding
		0	no
		1	yes