NAME:  	Benign Breast Disease 1-3 Matched Case-Control Study (BBDM13.DAT)
SIZE:  	200 observations, 14 variables
KEYWORDS:  Logistic Regression
TYPE: 	Matched Case-Control

SOURCE: These data come from Hosmer and Lemeshow (2000) Applied Logistic
 	Regression: Second Edition, page 245.  
 	These data are copyrighted by John Wiley & Sons Inc. and must be 
 	acknowledged and used accordingly.


DESCRIPTIVE ABSTRACT:

These data contain information from a 1 - 3 matched design studying the
risk factors associated with benign breast disease.  The data are a subset
from a hospital based case-control study designed to examine the
epidemiology of fibrocystic breast disease.  Data are provided on 50 women
who were diagnosed as having benign breast disease and 150 age matched
controls, with three controls per case.  Matching was based on the age of
the subject at the time of interview.

Cases included women with a biopsy-confirmed diagnosis of fibrocystic 
breast disease identified through two hospitals in New Haven, Connecticut.
Controls were selected from among patients admitted to the general surgery,
orthopedic, or otolaryngologic services at the same two hospitals.  Trained
interviewers administered a standardized structured questionnaire to collect
information from each subject [see Pastides et al. (1983) and Pastides, 
et al. (1985)].


LIST OF VARIABLES: 

Variable	Description			Codes/Values		Name
_____________________________________________________________________________

1		Stratum				1 - 50			STR
2		Observation within Stratum	1 = Case,		OBS
						2 - 4 = Control 
3		Age at Interview		Years			AGMT
4		Final Diagnosis 		1 = Case, 0 = Control	FNDX
5		Highest Grade in School		5 - 20			HIGD
6		Degree				0 = None		DEG
						1 = High School
						2 = Jr. College
						3 = College
						4 = Masters
						5 = Doctoral
7		Regular Medical Check-ups	1 = Yes, 2 = No         CHK
8		Age at First Pregnancy		Years			AGP1
9		Age at Menarche			Years			AGMN
10		No. of Stillbirths, 		0 - 7			NLV
		Miscarriages etc. 
11		Number of Live Births		0 - 11			LIV
12		Weight of the Subject 		Pounds			WT
		At Interview
13		Age at Last Menstrual Period	Years			AGLP
14		Marital Status			1 = Married		MST
						2 = Divorced
						3 = Separated
						4 = Widowed
						5 = Never Married
________________________________________________________________________________
Missing values are denoted by "." in the listing of the data.


PEDAGOGICAL NOTES:

These data have been used as an example of fitting a logistic 
regression model for matched case-control studies.


REFERENCES:

1.   Pastides, H., Kelsey, J.L., Holford, T.R., and LiVolsi, V.A., (1985).
     The epidemiology of fibrocystic breast disease.  American Journal of 
     Epidemiology, 121, 440-447.

2.   Pastides, H., Kelsey, J.L., LiVolsi, V.A., Holford, T., Fischer, D., 
     and Goldberg, I.(1983).  Oral contraceptive use and fibrocystic breast
     disease with special reference to it histopathology.  Journal of the
     National Cancer Institute, 71, 5-9.

3.   Hosmer and Lemeshow, Applied Logistic Regression, Wiley, (1989).