| We thank Yangbo He for suggestions on calculating the percent variance when controlling for confounding variable. |
| Hence, selection of confounding variable for adjustment starts with identifying risk factors for the outcome. |
| Hence, the effect of confounding variable of HPV infection in present study remains to be proved. |
| Discussions of group and cooperative learning have often ignored individual difference as potential confounding variable. |
| So we get rid of the confounding variable of immigration and we get the same results. |
| The night suited his methods, because the sun, that confounding variable, was always moving. |
