Table 3.

Number of events and estimated attenuation period derived from the Twitter data.

Keyword (Japanese)	Twitter ID count	Event	Censor	% Censored	Mean, days	95% Lower Control Limit	95% Upper Control Limit
radioactive (放射能)	1,168,542	880,108	288,434	24.68	31.9	31.7	32.1
radiation (放射線)	1,168,542	710,924	457,618	39.16	63.4	63.1	63.7
Sv	1,168,542	107,522	1,061,020	90.8	300.6	300.2	301.0
Bq	1,168,542	53,034	1,115,508	95.46	330.3	330.0	330.6
Gy	1,168,542	17,111	1,151,431	98.54	354.6	354.4	354.8