TABLE 3.

Fixed effect estimates (β) for PPDs corresponding to active listening, together with CIs

	Active PPD
	Β	CI (95%)
(Intercept)	+0.220	+0.182 to +0.259
Intelligibility (A)	–0.038	–0.072 to –0.003
Intelligibility (B)	–0.045	–0.074 to –0.015
Copresence	+0.029	+0.002 to +0.055
Intelligibility (A) × Copresence	–0.001	–0.041 to +0.040
Intelligibility (B) × Copresence	+0.020	–0.020 to +0.059

The backward difference contrast coding resulted in two beta estimates for intelligibility, labeled contrast A (50% compared with 20%) and contrast B (80% compared with 50%). Copresence represents the difference in PPD when doing the task in the presence of another participant, compared with alone.

CIs, confidence intervals; PPD, peak pupil dilation.