. 2021 May 19;23(5):e27331. doi: 10.2196/27331

Table 2.

Prevalence of poor sleep and insomnia in health care workers working during the COVID-19 pandemic (N=963).

Variable		Value
Poor sleep quality^a, n (%)		920 (95.5)
Insomnia^b , n (%)
	Absent	220 (25.1)
	Subthreshold	367 (41.9)
	Moderate	249 (28.5)
	Severe	39 (4.5)
Sleep duration (hours)^c, average (SD)		6.1 (1.2)

^aAs measured by the Pittsburgh Sleep Quality Index (PSQI); poor sleep quality was defined as a PSQI score ≥5 [20].

^bAs measured by the Insomnia Severity Index (ISI); insomnia was qualified by ISI score, interpreted as absent (0-7), subthreshold (8-14), moderate (15-21), or severe (22-28) [21].

^cAverage hours of sleep duration was defined by the PSQI [20].