The Importance of Cancer Registry Linkage for Studying Rare Cancers in Prospective Cohorts

Table 4

Factors associated with false positive and incorrect site self-reporting.

	Report cancer incorrectly vs. correctly (FP vs. TP)		Report site incorrectly vs. correctly (TP incorrect vs. TP correct)
Variable	Adjusted OR (95% CI)	value	Adjusted OR (95% CI)	value
Age at report
<50	1.0		1.0
50 to <60	0.54 (0.34, 0.85)	0.008	2.52 (0.80, 7.99)	0.116
60 to <70	0.29 (0.18, 0.45)	<0.001	1.23 (0.38, 3.96)	0.732
≥70	0.35 (0.20, 0.59)	<0.001	4.19 (1.29, 13.6)	0.017
Smoking
Never	1.0		1.0
Former	1.59 (1.10, 2.29)	0.013	0.80 (0.43, 1.48)	0.478
Current	2.05 (1.29, 3.24)	0.002	1.48 (0.68, 3.20)	0.325
ACR diagnosis type
Common			1.0
Rare	N/A		13.7 (7.60, 24.5)	<0.001

FP: false positive; TP: true positive; FN: false negative; OR: odds ratio; NS: not significant; N/A: not applicable; ACR: Alberta Cancer Registry.