highly significantP < 0.001
There was a highly significant difference between layers II/III and V ( z = −3.77, P < 0.001) and layers II/III and VI ( z = −3.12, P < 0.001).
There was a highly significant difference between layers II/III and V ( z = −3.77, P < 0.001) and layers II/III and VI ( z = −3.12, P < 0.001).