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Omorou, Marie-Pierre Sylvestre, Jennifer Brunet, Jennifer O'Loughlin Journal of Adolescent Health 23

Moreover, the covariate selection algorithm identified a significant difference between data points that were maximally controlled and those that were not and a further difference between data points that controlled for age, sex, and smoking, and those that did not control for smoking, so the two corresponding covariates were used to accordingly adjust the observations included (Table 2)