Table 2.

Results from the negative binomial portion of the ZINB models [exp(B), 95% confidence intervals, p-value] estimating the effect of sleep variables (PSQI score, ISI score, TST) and confounding factors (age, gender, BMI) in April 2020 on the number of long-term symptoms one month (M1, M2, M3) and three months after COVID-19 (M4, M5, M6).

	exp(B)	95% CI	p	exp(B)	95% CI	p	exp(B)	95% CI	p
	M1: sleep quality			M2: insomnia severity			M3: sleep duration
Intercept	2.325	1.461–3.699	< 0.001	2.315	1.465–3.658	< 0.001	9.182	4.494–18.761	< 0.001
Gender*	0.912	0.724–1.149	0.433	0.878	0.701–1.101	0.260	0.819	0.649–1.034	0.093
Age	0.990	0.983–0.998	0.009	0.992	0.984–0.999	0.030	0.987	0.979–0.995	0.001
BMI	1.023	1.006–1.041	0.008	1.024	1.006–1.041	0.008	1.026	1.008–1.045	0.004
PSQI score	1.070	1.046–1.094	< 0.001
ISI score				1.049	1.033–1.064	< 0.001
TST (hour)							0.889	0.840–0.941	< 0.001
	M4: sleep quality			M5: insomnia severity			M6: sleep duration
Intercept	1.312	0.551–3.124	0.540	1.706	0.776–3.752	0.184	8.668	2.478–30.317	0.001
Gender*	0.925	0.592–1.446	0.733	0.999	0.644–1.550	0.997	0.816	0.522–1.278	0.375
Age	1.002	0.987–1.018	0.772	1.002	0.988–1.017	0.746	0.996	0.980–1.012	0.628
BMI	1.021	0.990–1.054	0.184	1.017	0.986–1.048	0.284	1.027	0.995–1.059	0.097
PSQI score	1.091	1.047–1.136	< 0.001
ISI score				1.054	1.027–1.082	< 0.001
TST (hour)							0.853	0.769–0.946	0.003

Notes: *Female was used as reference for “Gender” factor; significant values are in bold.

Abbreviations: BMI, Body mass index; CI, Confidence interval; ISI, Insomnia Severity Index; M, Model; PSQI, Pittsburgh Sleep Quality Index; TST, Total sleep time.