Motivational and achievement differences among children of various ordinal birth positions.
D000124:Achievement; D000704:Analysis of Variance; D001288:Attention; D001722:Birth Order; D002648:Child; D004328:Drive; D006801:Humans; D007360:Intelligence; D009042:Motivation; D012919:Social Behavior; D012928:Social Desirability; D012959:Socioeconomic Factors