Proportion of dyads reporting interaction of specified type, and the yearly interaction rate estimated from equation 2, with effects of kinship and ritual relationship controlled.

Note: # = raw proportion of sample interacting for each interaction type. ## = mean yearly probability of interaction based on eqn 1 & 2 with variables ritual, closekin and affine, plus a constant term and averaged over all dyads. * = Hazda and Ache mean rates are significantly different at the 5% level (see File S1 for details on calculations).