Table 1.

Clinical-epidemiological characteristics of patients with COVID-19 during the first and second waves.

Variables	Pandemic wave
	First wave (n = 36938)		Second wave (n = 16974)
	N	%	n	%
Age (years)a	44.87 ± 20.5		47.92 ± 20.8
Age (categorized)
Child (0-11)	1859	5	626	3.7
Adolescent (12-17)	1451	3.9	535	3.2
Young (18-29)	5570	15.1	2431	14.3
Adult (30-59)	18539	50.2	8092	47.7
Older adult (60-)	9519	25.8	5290	31.2
Gender
Female	20803	56.3	8444	49.8
Male	16135	43.7	8530	50.3.
Clinical characteristics
General malaise	16721	45.3	12044	71.0
Cough	16578	44.9	9556	56.3
Sore throat	14003	37.9	7205	42.5
Fever	12162	32.9	6215	36.6
Headache	11640	31.5	6219	36.6
Nasal congestion	6817	18.5	4473	26.4
Muscle pain	6185	16.7	3826	22.5
Respiratory distress	6569	17.8	3586	21.1
Diarrhea	5089	13.8	3096	18.2
Chills	521	1.4	1787	10.5
Chest pain	3923	10.6	1738	10.2
Nausea	2274	6.2	1257	7.4
Anosmia	334	0.9	1158	6.8
Ageusia	290	0.8	977	5.8
Dyspnea	1314	3.6	972	5.7
Abdominal pain	1082	2.9	596	3.5
Ear pain	48	0.1	204	1.2
Pharyngeal exudate	343	0.9	104	0.6
Irritability	298	0.8	79	0.5
Conjunctival injection	108	0.3	44	0.3
Seizure	8	0.0	2	0.0
Comorbidities
Cardiovascular disease	4078	11.0	2445	14.4
Diabetes	2236	6.1	1251	7.4
HIV	42	0.1	12	0.1
Kidney disease	364	1.0	215	1.3
Lung disease	371	1.0	110	0.7
Cancer	399	1.1	281	1.7
Obesity	208	0.6	921	5.4
Pregnancy	1208	3.3	574	3.4

^aMean and SD