. 2021 Sep 14;63(1):e12273. doi: 10.1002/1348-9585.12273

TABLE 2.

The crude means and test for difference between means of the number of preventive measures among 23 items at baseline (T1), T2, T3, and T4 during the COVID‐19 pandemic among the cohort of Japanese employees (N = 800)

Survey (time of survey)	The number of preventive measures among 23 items		Test for difference between means of two time points
Survey (time of survey)	Mean	SD	T2	T3	T4
T1 (March 2020)	11.3	6.0	−3.4^**	−3.6^**	−2.1^**
T2 (May 2020)	14.6	5.7	–	−0.3	1.3^**
T3 (August 2020)	14.9	5.9	–	–	1.5^**
T4 (November 2020)	13.4	6.2	–	–	–
Test for difference	F = 193.31, P < .001

COVID‐19: Coronavirus disease 2019; SD: standard deviation.

^**

P <.001.