Table 2. The risks of developing cancers in the stroke and control groups.

Characteristics	Stroke				Control				Crude HR$ (95% CI)	Adjusted HRb (95% CI)
	N	Cancer	#PY	Ratea	N	Cancer	#PY	Ratea
All	17161	1408	149263.46	9.43	68644	6763	665975.77	10.16	0.93 (0.88-0.98)*	0.79 (0.74-0.84)*
Age
≦40	688	22	6475.73	3.40	2752	46	28976.48	1.59	2.15 (1.29-3.57)*	1.79 (0.99-3.23)
40-60	4116	276	38214.12	7.22	16464	1116	166239.69	6.71	1.08 (0.95-1.23)	0.90 (0.77-1.05)
60-80	10002	975	86312.45	11.30	40008	5015	382530.71	13.11	0.86 (0.80-0.92)*	0.76 (0.71-0.82)*
>80	2355	135	18261.16	7.39	9420	586	88228.89	6.64	1.08 (090-1.31)	0.73 (0.60-0.90)*
Gender
Male	10039	946	85478.29	11.07	40156	4464	385779.52	11.57	0.96 (0.89-1.02)	0.81 (0.75-0.88)
Female	7122	462	63785.17	7.24	28488	2299	280196.25	8.21	0.88 (0.80-0.98)*	0.74 (0.67-0.83)

#PY: person-years.

^$HR: hazard ratio.

^aRate: per 1000 person-years.

^bAdjusted by age groups, gender and comorbidities.

^*P-value<0.05.