Finally, cross-sectional research found that among the 64 predominantly white, middle-class tenth-grade adolescents sampled, that males who have a mother who works are more likely to have arguments with their siblings and the arguments are likely to last longer when compared to males who have a mother that does not work (Montemayor, 1984). No relationship was found with female siblings. Montemayor (1984) concludes that male adolescents with mothers who work full-time exhibit higher levels of conflict towards their siblings because they often have more responsibilities to tend to at home when compared to adolescent children of mothers who do not work full-time, and they spend more time at home together outside the presence of an adult, who, if home, could serve as a mediator during sibling conflict.