Table 3.

Episodic memory test performance (odds ratio for making a mistake) predictions based on sleep condition and time-of-day effects in the final mixed-effects model.

	Mistake
Fixed-effect predictors	Odds ratios	CI	p
(Intercept)	0.21	0.16–0.27	<0.001
Within-test recall order [2 vs. 1]	0.47	0.44–0.52	<0.001
TSD condition at baseline (22:30)	0.90	0.67–1.20	0.46
Session 1 (08:00)	0.88	0.69–1.12	0.31
Session 2 (12:30)	0.99	0.78–1.25	0.92
Session 3 (16:30)	0.94	0.74–1.20	0.62
TSD	1.63	1.24–2.14	<0.001
TSD:Session 1 [TSD effect compared to session 3]	1.08	0.80–1.48	0.61
TSD:Session 2 [TSD effect compared to session 3]	0.66	0.49–0.90	<0.01
Observations	29,195
Marginal R2	0.05

Note: CI, 95% confidence interval; TSD, total sleep deprivation; Marginal R² represents the variance explained by the fixed-effects predictors (Nakagawa et al., 2017). Within-test recall order represents the effect of the second presentation of the words with new dummy words on performance. All rows representing categorical variables report the effect compared to a reference level. The reference level for session was the baseline session (22:30 h) therefore all other effect estimates for different levels of session compare to performance at 22:30 h. The reference level for TSD was the normal sleep group. For models including an interaction between TSD and session, the effect estimate for TSD refers to the effect of TSD on performance at Session 3. Interactions between TSD and session therefore refer to differences in the effect of TSD between the stated Session (i.e., 1 or 2) and Session 3.