Clinical Manifestations of Ultrasonic Virtual Reality in the Diagnosis and Treatment of Cardiovascular Diseases

Table 5

The average value and standard deviation of some important indicators in the hypertension survey data of the surveyed patients.

Index	Mathematical expectation	Variance	Covariance	Standard deviation
Age	41.43	1.93	2.22	2.01
Gender	1.53	2.15	1.88	2.02
Smokes	1.63	1.92	2.21	2.05
Annual family income	3.66	1.82	2.01	2.43
Excessive alcohol intake	1.69	2.16	2.48	1.81
BMI	22.14	2.29	1.93	2.48
Family history of hypertension	1.13	1.8	1.98	2.34
Lack of physical exercise	1.98	2.47	2.32	2.31
Marital status	1.34	2.35	2.14	2.06
Education level	2.36	3.14	2.39	2.01