Table 3. Comparison of Mean Metabolic Parameter Values among the Groups Divided by Age and Weight Change^a.

Variable	Age <50 yr and weight change <−5% (n=6,923)	Age ≥50 yr and weight change <−5% (n=441)	Age <50 yr and weight change −5% to 5% (n=44,599)	Age ≥50 yr and weight change −5% to 5% (n=2,984)	Age <50 yr and weight change >5% (n=10,610)	Age ≥50 yr and weight change >5% (n=299)
Age, yr	38.2±5.4	55.1±5.9	38.6±5.3	54.4±5.3	36.7±5.3	54.2±5.1
Male sex	3,634 (52.5)	297 (67.3)	27,149 (60.9)	1,978 (66.3)	5,920 (55.8)	178 (59.5)
Body weight, kg	68.2±12.8	66.5±10.5	66.3±12.3	65.5±9.9	64.1±11.8	62.7±10.1
Body mass index, kg/m2	26.3±3.2	24.3±2.7	23.3±3.1	23.8±2.6	22.6±3.1	22.9±2.7
Muscle mass, kg	46.8±9.6	46.5±8.6	47.2±9.2	46.2±8.2	45.9±9.1	44.3±8.1
Body fat mass, kg	18.5±5.6	17.2±4.8	16.3±5.2	16.5±4.8	15.4±5.5	15.7±5.0
Body weight change, kg	−5.55±2.6	−4.83±1.7	0.15±1.7	−0.18±1.6	5.32±2.4	4.73±1.7
Percent change of body weight, %	−8.10±3.1	−7.25±2.3	0.25±2.6	−0.26±2.5	8.34±3.5	7.61±2.7
Lean mass change, kg	−1.92±1.7	−2.20±1.6	−0.57±1.5	−0.88±1.5	0.83±1.6	0.60±1.5
Percent change of lean mass, %	−2.81±2.4	−3.29±2.4	−0.89±2.2	−1.36±2.3	1.25±2.5	0.89±2.4
Annual percent change of lean mass, %	−0.70±0.6	−0.82±0.6	−0.22±0.6	−0.34±0.6	0.31±0.6	0.22±0.6
Fat mass change, kg	−3.49±2.6	−2.41±2.1	0.77±1.9	0.84±1.9	4.44±2.3	4.13±2.0
Percent change of fat mass, %	−5.06±3.6	−3.62±3.1	1.22±2.9	1.31±2.9	7.00±3.6	6.74±3.4
Annual percent change of fat mass, %	−1.27±0.9	−0.90±0.8	0.30±0.7	0.33±0.7	1.75±0.9	1.69±0.9
Regular exercise	1,613 (23.3)	100 (22.7)	994 (22.3)	718 (24.1)	2,716 (25.6)	93 (31.1)
Current smoker	1,275 (18.4)	66 (15.0)	9,940 (22.3)	494 (16.6)	2,627 (24.8)	78 (26.1)
Alcohol consumption	1,101 (15.9)	92 (20.9)	7,552 (16.9)	678 (22.7)	1,441 (13.6)	66 (22.1)

Values are expressed as mean±SD or number (%).

^aMean values of all groups were significantly different when analyzed by one-way analysis of variance test.