highly significantP = 9.02×10 −81
A sizeable and highly significant correlation between ingroup reception and ingroup transmission was identified in both conditions (Balanced: OR = 5.56, 95% CI [4.67, 6.65], P = 9.02×10 −81 ; Ingroup-biased: OR = 4.70, 95% CI [3.38, 6.58], P = 8.45×10 −20 ; see S7 Table for details).