Table 4.

Summary of significant fixed effects.

Variable	Age	Within-person interlocutors	Age × Within-person interlocutors
Entropy		Child < Spouse aFor patients: Friend < Spouse	Decreased with age when talking to children
The average frequency of nouns			Increased with age when talking to children and friends
Clauses per sentence		Stranger < Spouse Multiparty < Spouse aFor patients: Child < Spouse	bFor partners: Decreased with age when talking to strangers

<, >, Comparisons indicated direction of significant effects; Multiparty, Multiparty conversations; ^aFor patients, Effects were only significant for patients; and ^bFor partners, Effects were only significant for partners.