It is unclear how delay discounting and substance use develop across adolescence and whether contextual factors alter their trajectories. The present study used a longitudinal design to examine whether socioeconomic status is related to developmental trajectories of delay discounting and substance use across adolescence. The sample included 167 adolescents (M_age = 14 at Time 1; 53% male) and their parents who participated annually across four years. Parents reported SES at Time 1 and adolescents completed delay discounting behavioral assessments and substance use questionnaires at Times 1 to 4. Bivariate latent growth curve modeling revealed that low SES was related to steeper increases in substance use from age 14 through 17, mediated through elevated delay discounting at age 14. The findings clarify the mediating role of delay discounting in linking family economic environment to the progression of substance use.

目前还不清楚延迟折扣和物质使用在青春期是如何发展的，以及背景因素是否会改变它们的轨迹。本研究采用纵向设计来检验社会经济地位是否与青春期延迟贴现和物质使用的发展轨迹相关。样本包括 167 名青少年（第一时间M_年龄 = 14；53% 为男性）及其父母，他们在四年内每年参与一次。父母在第 1 次报告 SES，青少年在第 1 至 4 次完成延迟贴现行为评估和物质使用调查问卷。双变量潜在增长曲线模型显示，低 SES 与 14 岁至 17 岁期间物质使用急剧增加有关，这是通过延迟增加来介导的14 岁时折扣。研究结果阐明了延迟折扣在家庭经济环境与物质使用进展之间的中​​介作用。