. 2022 May 30;12:8990. doi: 10.1038/s41598-022-12841-x

Table 1.

Demographic characteristics.

Age group (%)	20–30 s	40 s	50 s	60–70 s
Age group (%)	17.7	26.6	38.3	17.3
Teaching experience (%)	< 5 years	5–10 years	10–20 years	> 20 years
Teaching experience (%)	25.8	13.3	32.3	28.6
# of lectures as online education	4.22 ± 3.23 (1–20)^a
Preparation time per one class (min.) Synchronous online courses	192.0 ± 178.2 (0–1440)^a
Preparation time per one class (min.) Asynchronous online courses	331.9 ± 323.6 (7–2400)^a
Difficulty score for IT devices	2.71 ± 0.95 (1–4)^a
Satisfaction score for administration support	3.46 ± 0.87 (1–5)^a

^aAverage ± standard deviation (range).