Table 1.

Mean differences in search index values (SIV) for stroke between the period of interest and the control period from 2011 to 2019.

Year	Mean SIV in the 4 weeks surrounding World Stroke Day, period of interest	Mean SIV in the remaining weeks of the year, control period	Mean difference in SIV (95% CI)	P value
2011	802.3	506.8	295.5 (164.5 to 426.4)	<0.001
2012	985.2	634.3	350.9 (164.8 to 537.0)	<0.001
2013	894.3	702.6	191.6 (60.7 to 322.6)	0.006
2014	1068.4	724.2	344.1 (164.9 to 523.4)	<0.001
2015	1538.9	944.6	594.3 (285.4 to 903.1)	<0.001
2016	1560.1	1126.6	433.5 (287.2 to 579.8)	<0.001
2017	1751.3	1424.0	327.3 (160.5 to 494.1)	<0.001
2018	2714.0	1918.2	795.7 (416.9 to 1174.5)	<0.001
2019	2858.9	2427.1	431.7 (52.1 to 811.3)	0.027
Overall	1574.8	1156.3	418.5 (298.8 to 538.2)	<0.001