Table 3.

Thyroid hormone patterns among groups.

Definitions	Thyroid hormone patterns	ICU (n = 80)		Ward (n = 101)		Outpatients (n = 15)
		COVID-19 (n = 41)	Non-COVID-19 (n = 39)	COVID-19 (n = 46)	Non-COVID-19 (n = 55)	COVID-19 (n = 15)
Normal (41.3%)		12 (29.3%)	9 (23.1%)	25 (54.3%)	25 (45.5%)	10 (66.7%)
Non-thyroidal illness syndrome (43.4%)		23 (56.1%)	26 (66.7%)	18 (39.1%)	21 (38.2%)	3 (20%)
	Only Low T3 (34.2%)	18 (43.9%)	16 (41.0%)	16 (34.8%)	17 (30.9%)	0
	Low T3 and low FT4 and normal TSH (4.1%)	3 (7.3%)	4 (10.3%)	0	1 (1.8%)	0
	Low T3, low/low-normal FT4 and low TSH (5.1%)	2 (4.9%)	5 (12.8%)	1 (2.2%)	1 (1.8%)	1 (6.7%)
	High FT4, low/normal T3 and normal TSH (4.6%)	0	1 (2.6%)	1 (2.2%)	2 (3.6%)	2 (13.3%)
Thyrotoxicosis (8.2%)		6 (14.6%)	3 (7.7%)	2 (4.3%)	4 (7.3%)	1 (6.7%)
Overt thyrotoxicosis (1.5%)	High FT4 and/or high T3 and low TSH	1 (2.4%)	0	1 (2.2%)	1 (1.8%)	0
Subclinical thyrotoxicosis (6.6%)	High-normal FT4 and low TSH	5 (12.5%)	3 (7.7%)	1 (2.2%)	3 (5.5%)	1 (6.7%)
Hypothyroidism (4.1%)
Overt hypothyroidism (0.5%)	High TSH and low FT4	0	0	0	1 (1.8%)	0
Subclinical hypothyroidism (3.6%)	High TSH and normal FT4	0	1 (2.6%)	1 (2.2%)	4 (7.3%)	1 (6.7%)

Normal ranges; FT4 0.9–1.7 ng/dL (low < 0.9 ng/dL, low-normal <1.3 ng/dL, high-normal>1.3 ng/dL, high > 1.7 ng/dL), T3 80–200 ng/dL (low < 80 ng/dL, high > 200 ng/dL), TSH 0.3–4.2 μIU/mL (low<0.3 μIU/mL, high> 4.2 μIU/mL).