Table II.
Immunohistochemical staining for IDO and TGF-β in chorionic villi and decidua from normal pregnancies.
| Y(Intensity of IDO immunostaining) | ||||
|---|---|---|---|---|
| X (intensity of TGF-β immunostaining) | + | ++ | +++ | Total |
| − | 2 | 0 | 0 | 2 |
| + | 1 | 5 | 0 | 6 |
| ++ | 2 | 10 | 2 | 14 |
| +++ | 0 | 1 | 1 | 2 |
| Total | 5 | 16 | 3 | 24 |
| Linear-By-linear association | 6.264 | |||
| Asymp.Sig (2-sided) | 0.012 | |||
| Spearman's correlation | 0.474 | |||
| Approx. Sig. | 0.019 | |||
The results from linear-by-linear association are 6.264, which shows that there is a linear trend between IDO and TGF-β. The correlation coefficient calculated by Spearman's correlation is 0.474 (P=0.019), further explaining that they are negatively correlated.