Table 3 Cross-correlation between monthly HIV/AIDS report cases and Baidu search index data.

Keyword (in English)	Maximum CCF	P value	Keyword (in English)	Maximum CCF	Lag (month)	P value
Papule	0.875	<0.001	Zidovudine	0.638	0	<0.001
Early symptoms of HIV	0.781	<0.001	Acyclovir	0.620	0	<0.001
Thrush	0.777	<0.001	AIDS examination	0.615	0	<0.001
HIV	0.760	<0.001	AIDS virus	0.585	0	<0.001
Sexual services	0.746	<0.001	Prostitute	0.580	0	<0.001
AIDS window period	0.702	<0.001	AIDS-testing	0.578	0	<0.001
Spread of AIDS	0.678	<0.001	AIDS test strip	0.568	0	<0.001
Street walker	0.664	<0.001	AIDS	0.533	0	<0.001
How to check AIDS	0.657	<0.001

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