NORAD and deep vein thrombosis: As displayed in Fig. 2C, D-dimer (HR = 3.427, 95% CI = 1.471–7.980), age (HR = 2.577, 95% CI = 1.019–6.516) and lncRNA NORAD gene (HR = 3.363, 95% CI = 1.172–9.650) were independently influence factors related to the development of PTS for DVT patients.