Table 2. Crude means of psychological distress^a at baseline (T1), T2 and T3 under the COVID-19 pandemic among a cohort of Japanese full-time employees (N = 1,275).

Survey (time of survey)	Total N	Low Education^b			High Education^b

		n	Mean	SD	n	Mean	SD
T1 (March 2020)	1,275	607	41.0	11.2	668	41.2	11.5
T2 (May 2020)	968	454	41.5	11.3	514	41.0	10.9
T3 (August 2020)	1,148	541	42.7	11.7	607	41.4	11.5

COVID-19: Coronavirus disease 2019.

SD: standard deviation.

^aPsychological distress was measured using a scale from the Brief Job Stress Questionnaire (BJSQ). Scores ranged from 18 to 72, with a higher score indicative of higher distress. Cronbach’s alpha coefficients of the scale ranged from 0.93–0.94 among the T1, T2, and T3 surveys.

^bHigh education was defined as ≥16 years of educational attainment (ie, university graduate or higher).

Table 2. Crude means of psychological distressa at baseline (T1), T2 and T3 under the COVID-19 pandemic among a cohort of Japanese full-time employees (N = 1,275).

Table 2. Crude means of psychological distress^a at baseline (T1), T2 and T3 under the COVID-19 pandemic among a cohort of Japanese full-time employees (N = 1,275).