Table 1.

Trends and monthly percentage change of search volumes for the 3 working conditions.

Working conditions and their periods studied		Trend (P value)	Monthly percentage change of search volumes (95% CI)
Overwork
	January 2004 to June 2010	↓ (P<.001)	–1.08 (–1.45 to –0.71)
	June 2010 to March 2011	↑ (P<.001)	28.97 (19.25 to 39.49)
	March 2011 to July 2011	↓ (P=.014)	–36.06 (–55.14 to –8.87)
	July 2011 to November 2015	↓ (P=.004)	–0.99 (–1.66 to –0.32)
	November 2015 to December 2017	↑ (P=.006)	2.99 (0.86 to 5.16)
	December 2017 to November 2019	↓ (P=.020)	–2.50 (–4.55 to –0.41)
Working hours
	January 2004 to September 2013	↔ (P=.768)	0.02 (–0.11 to 0.15)
	September 2013 to October 2016	↑ (P<.001)	1.78 (1.14 to 2.43)
	October 2016 to January 2017	↔ (P<.470)	19.07 (–26.00 to 91.59)
	January 2017 to May 2017	↔ (P=.194)	–14.22 (–32.00 to 8.22)
	May 2017 to November 2019	↔ (P=.121)	–0.59 (–1.34 to 0.16)
Job stress
	January 2004 to January 2008	↓ (P<.001)	–0.93 (–1.45 to –0.41)
	January 2008 to April 2008	↔ (P=.810)	12.49 (–57.19 to 195.55)
	April 2008 to March 2013	↓ (P<.001)	–1.64 (–2.10 to –1.18)
	March 2013 November 2019	↑ (P=.026)	0.39 (0.05 to 0.73)