In the TOSS sample the Partner Bonding Scale was used to assess pair-bonding behavior amongst the adult twins and their spouses. It includes items that are analogous to measures of behavioral patterns observed amongst nonhuman primates. The scale comprises items from the Dyadic Adjustment Scale (DAS) (52), a frequently used assessment of the quality of marital relationships and similar dyads, the Support Seeking and Giving (SSG) (56) assessment measuring subjects’ engagement with other people, and the Marital Instability Scale (MIS) (57). A more detailed description of the scale is presented elsewhere (49).
