Table 1. General characteristics of the study population (N = 124).

TMD: temporomandibular disorder

Characteristics		Frequency (N)	Percentage (%)
Sociodemographic characteristics
Age groups (years)	≤ 35	75	60.5
	> 35	49	39.5
Sex	Male	45	36.3
	Female	79	63.7
Marital status	Single living alone	22	17.7
	Single living with parents	46	37.1
	Married without children	11	8.9
	Married with children	45	36.3
Country of residence	Lebanon or Syria	80	80.8
	Others	19	19.2
TMD- and obstructive sleep apnea-related characteristics before COVID-19 infection
Teeth clenching or grinding	Yes	48	38.7
	No	76	61.3
Jaw or masticatory muscle problem	Yes	58	46.8
	No	66	53.2
Obstructive sleep apnea	Yes	44	35.5
	No	80	64.5
COVID-19-related characteristics
Stress level during the infection	Low	19	15.3
	Moderate	69	55.6
	High	36	29.0
Fatigue during the infection	Yes	49	39.5
	No	75	60.5
Worsening of teeth clenching/grinding and/or jaw problem during the infection (n = 76)	Yes	35	46.1
	No	41	53.9
Pain in the temple, face, and masticatory muscles during the infection	Yes	40	32.3
	No	84	67.7
Jaw locking during the infection	Yes	9	7.3
	No	115	92.7
TMD worsened or appeared during the infection	Yes	52	41.9
	No	72	58.1
Worsening of obstructive sleep apnea during the infection (n = 44)	Yes	25	56.8
	No	19	43.2
Fever episodes during the infection	Yes	51	41.1
	No	73	58.9
Gastro-esophageal reflux during the infection (n = 122)	Yes	42	33.9
	No	80	64.5
Loss of taste during the infection	Yes	87	70.2
	No	37	29.8
Toothache during the infection	Yes	28	77.4
	No	96	22.6
Need of oxygen supply during the infection (n = 123)	Yes	7	5.7
	No	116	94.3
Hospitalization during the infection (n = 121)	Yes	7	5.8
	No	114	94.2
Masticatory function after recovering from COVID-19 (n = 98)	Normal	33	33.7
	Altered	65	66.3