Lien 2006 examined the effects of soft drinks on Norwegian middle school students. Which of the following results did Lien obtain?
boys were more adversely affected by soft drink consumption than girls
there were no statistically significant differences between the effect of soft drink consumption on boys and girls.
students who drank no soft drinks performed better than those who drank moderate amounts
students who drank moderate amounts soft drinks performed better than those who drank none at all.