A Significant Association of Upper Limb Muscle Strength with Thyroid Function in Overweight and Obese Population: A Study of the Sixth Korea National Health and Nutrition Examination Survey (KNHANES 2014-2015)

Table 1

Baseline characteristics.

Characteristics	Unweighted sample size (n = 3503)	Weighted sample size (n = 10430802)
Sex (men, %)	1788 (51.0)	5315537 (51.0%)
Age, years	43.8 ± 14.9 (19–80)	43.7 ± 0.3 (19–80)
≥40 (n, %)	2027 (57.9)	(57.2)
<40 (n, %)	1,476 (42.1)	(42.8)
BMI, kg/m^2	23.88 ± 3.60 (14.65–43.82)	23.84 ± 0.07 (14.65–43.82)
≥23	1981 (56.6)
<23	1522 (43.5)
Dominant hand	3430
Right (n, %)	3,040 (88.6)	(88.8)
Left (n, %)	182 (5.3)	(5.2)
Both (n, %)	208 (6.1)	(6.0)
Handgrip strength, kg	33.39 ± 10.31 (8.08–70.57)	35.07 ± 0.20 (8.08–70.57)
FT4, ng/dL	1.25 ± 0.16 (0.89–1.76)	1.25 ± 0.00
TSH, uIU/mL	2.61 ± 1.86 (0.01–29.50)	2.59 ± 0.03

Values are presented as number (%) or mean ± SD (range). BMI, body mass index (calculated as weight divided by height squared (kg/m²)). FT4, free thyroxine. TSH, thyrotropin.