Men with older brothers are more likely to be gay, according to a study published Wednesday in the journal Proceedings of the Royal Society B. This new report builds upon previous research regarding male birth order and homosexuality, though there is still no decisive conclusion as to why there’s a link between the two.

In cross-analyzing data from 10 scientific studies with more than 5,000 subjects, researchers found that men with older brothers were 38 percent more likely to identify as gay.