Decomposition of interactions showed that DSST score of the OSA group with NT-pro-BNP ≥ 157.0 ng/L (M = 33.2; SD = 8.1) were significantly lower (p = 0.031), than those of the mild/non-OSA with NT-pro-BNP < 157.0 ng/L (M = 37.7; SD = 8.9). The gene discussed is NPPB; the disease is obstructive sleep apnea syndrome.