marginally significantp = 0.077
Interaction between “age” and “reginal population size” was marginally significant ( p = 0.077), suggesting individuals in Kanto and Kinki, which are densely populated regions, tended to be young. “VL” positively correlated with the property of dTC affiliation in both dTC ≥10 and dTC ≥20 , although the regression coefficients were low (beta = 1.48 × 10 −7 and 1.51 × 10 −7 , respectively).