The amplitude density of P-wave was difference in every stage of diabetic retinopathy but there was no significance in statistics.
波振幅密度在糖尿病视网膜病变各分期间也有差异，但无统计学意义。
2
The seismic attributes refer to physical quantities, which are derived from seismic data and related with the geometry, kinematics, dynamics and statistics characteristic of seismic wave.