Table 6.

Cross-validation of models presented in Tables 1–5 to unseen testing data

Model presented in	Outcome	Predictor	Training data AUC (95% CI)	Testing data AUC (95% CI)
			Full model	Baseline model	Full model	P value
Table 1	Social activity probability	Sleepiness	0.82 (0.82 to 0.83)	0.79 (0.78 to 0.80)	0.81 (0.80 to 0.82)	<0.001
	Outcome	Predictor	Training data MSPE (RMSE)	Testing data MSPE (RMSE)
			Full model	Baseline model	Full model	Improvement over baseline model, %
Table 2	Social activity duration	Sleepiness	2.37 (1.54)	2.50 (1.58)	2.38 (1.54)	4.63 (2.40)
Table 3	Social activity duration	Sleep duration	14.50 (3.81)	14.99 (3.87)	15.29 (3.90)	−1.99 (−0.98)
Table 4	Sleepiness	Social activity duration	2.53 (1.59)	2.57 (1.60)	2.43 (1.56)	5.47 (2.77)
Table 5	Sleep duration	Social activity duration	4,695.91 (68.52)	5,882.18 (76.69)	5,862.28 (76.57)	0.34 (0.17)

AUC, area under the (receiver operating characteristic) curve; MSPE, mean squared prediction error; RMSE, root mean square error.