"Subthreshold" refers to a level that is just below a certain limit or threshold. It means that something is not strong or powerful enough to reach a specific point or intensity. Full definition
Such an approach is suggested by the finding of non-equivalent outcomes among children of parents with high versus low levels of subthreshold depression in TAU. (ebmh.bmj.com)
This relationship was stronger for girls than for boys in presence of clinically significant levels of depressive symptoms, but did not differ between the genders in the case of subthreshold levels of depressive symptoms. (capmh.biomedcentral.com)
Current diagnostic procedures, which classify people with subthreshold depression into complex discrete groups, might obscure the fact that depressive symptoms are dimensional and range from none to severe. (jamanetwork.com)