Table 1 Parameter estimates for linear mixed-effect models for response duration (N = 37) and approach distance (N = 37) as a function of playback (PB) type (second- or third-order alliance), social bond strength (SRI), number of consortships (Consort) and PB order on a given day for a given subject.

From: Cooperation-based concept formation in male bottlenose dolphins

  Estimate SE Confidence interval t value p value
(i) Response duration      
Intercept 9.3 8.5 −7.4 to 26.9 1.0 0.2
PB type (second order) 60.3 13.4 33.4 to 86.0 4.4 <0.0001
SRI −20.4 40.7 −82.3 to 63.0 −0.5 0.6
Consort −0.8 0.5 −1.8 to 0.04 −1.5 0.1
PB order 16.9 9.7 −1.5 to 35.5 1.7 0.09
(ii) Approach distance
Intercept 4.2 3.9 −3.1 to 11.7 1.0 0.2
PB type (second order) 20.5 6.3 8.5 to 32.2 3.2 0.002
SRI −6.5 19.0 −41.8 to 29.5 −0.3 0.7
Consort −0.1 0.2 −0.59 to 0.31 −0.5 0.5
PB order 6.1 5.0 −3.3 to 15.6 1.2 0.2
  1. Subject ID and caller ID were included as random effects. p values in bold indicate significant results. Baseline level is ‘third-order’ for PB type and 1 for PB order (the first or only playback on a given day).