Table 2.

Basic characteristics of the physical examinees at the medical examination centre; Shanghai, China, 2020–2021.

Variables	Subhealthy (n = 627)		Healthy (n = 70)		P value
	N/Mean	%/SD	N/Mean	%/SD
Age (years), mean (SD)	33.41	8.85	38.07	11.6	< 0.001a
WHR, mean (SD)	0.84	0.08	0.85	0.18	0.254a
BMI (kg/m2), mean (SD)	23.71	3.65	22.67	2.93	0.023a
Sex, N (%)					0.004b
Male	316	50.4	22	31.4
Female	311	49.6	48	68.6
Smoking status, N (%)					0.275b
Never smoked	498	79.4	60	85.7
Smoker	129	20.6	10	14.3
Educational level, N (%)					0.022b
Graduate student	130	21.1	6	8.6
University student	393	63.8	46	65.7
Secondary school students	27	4.4	6	8.6
High school and below or other	66	10.7	12	17.1
AST (U/L), mean (SD)	22.03	8.7	20.07	4.36	0.064a
ALT (U/L), mean (SD)	24.13	18.61	17.61	8.61	0.004a
AKP (U/L), mean (SD)	67.4	17.82	69.17	18.25	0.432a
GGT (U/L), mean (SD)	25.22	18.19	18.21	7.05	0.001a
TC (mmol/L), mean (SD)	4.96	0.7	4.43	0.48	< 0.001a
TG (mmol/L), mean (SD)	1.31	1.04	0.98	0.31	0.008a
LDL (mmol/L), mean (SD)	2.81	0.51	2.6	0.61	0.001a
RBC (× 1012/L), mean (SD)	4.77	0.48	4.55	0.46	< 0.001a
HGB (g/L), mean (SD)	142.18	16.04	140.98	19.08	0.561a
MCHC (g/L), mean (SD)	337.21	6.7	349.71	7.21	< 0.001a
HCT, mean (SD)	0.42	0.04	0.4	0.05	0.001a

^aUsed two independent-sample t tests, and ^b used the chi-square test. WHR waist-to-hip ratio, BMI body mass index, AST aspartate transaminase, ALT alanine transaminase, AKP alkaline phosphatase, GGT gamma-glutamyl transferase, TC total cholesterol, TG triglycerides, LDL low-density lipoprotein, RBC red blood cells, HGB haemoglobin, MCHC mean corpuscular haemoglobin concentration, HCT red blood cell specific volume.