Description of counter-matched neseted case-control data for the radiation and breast cancer study


Variable name		Description				Codes/range
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id			Subject ID				1-3372
tyr			Year start TB treatment			(19)12-54
dose			Estimated breast dose (Gy)		0-6.433
nof			Number of fluoroscopies			0-833
bc			Breast cancer diagnosis			0=No, 1=Yes
age.rx			Age at first TB treatment		0.09-65.55
age.out			Age at exit from cohort			8.31-93.23
age.in			Age at entry to cohort			2.34-65.80
cmgroup			Stratum for counter-matching		1=no examinations,
								2=1-149 examinations,
								3=150+ examinations
setno 			Label of sampled risk set		1-75
case 			Case-contol status			0=Control, 1=Case      
wt			Weights (=number at risk in stratum 
			used for counter-matching)		12-578