| POB | SI | SF | TIBC | STR | |
| POB r P value | 1 | 0.227 0.228 | 0.719 0.000 | −0.251 0.180 | 0.407 0.026 |
| SI r P value | 0.227 0.228 | 1 | 0.420 0.021 | 0.317 0.087 | 0.682 0.000 |
| SF r P value | 0.719 0.000 | 0.420 0.021 | 1 | −0.091 0.633 | 0.473 0.008 |
| TIBC r P value | −0.251 0.180 | 0.317 0.087 | −0.091 0.633 | 1 | −0.471 0.009 |
| STR r P value | 0.407 0.026 | 0.682 0.000 | 0.473 0.002 | −0.471 0.009 | 1 |