. 2018 Mar 16;5(1):e23. doi: 10.2196/mental.9519

Table 4.

The linear regression models with interaction components for the average of heart rate (HR), low frequency/high frequency (LF/HF) ratio, root mean square of the successive differences (RMSSD), recovery percentage, and recovery index during the first 3 hours of sleep.

Outcome	HR	LF/HF ratio	RMSSD	Recovery percentage	Recovery index
Intercept, estimate (SE)	7.61 (1.04)^a	0.724 (0.182)^a	−10.55 (1.55)^a	−49.34 (5.13)^a	−26.73 (5.86)^a
Alcohol (g/kg), estimate (SE)	14.47 (1.56)^a	0.386 (0.272)	−20.68 (2.32)^a	−46.05 (7.69)^a	−38.48 (8.78)^a
Physical activity class, estimate (SE)	−0.33 (0.10)^b	−0.051 (0.018)^b	0.51 (0.15)^a	2.29 (0.51)^a	2.57 (0.59)^a
Age (0=18 years), estimate (SE)	0.03 (0.02)	0.004 (0.003)	−0.008 (0.03)	0.07 (0.09)	−0.05 (0.10)
BMI (0=18.5 kg/m²), estimate (SE)	0.19 (0.04)^a	0.005 (0.008)	−0.18 (0.07)^b	−0.60 (0.22)^b	−0.42 (0.25)
Gender (0=female, 1=male), estimate (SE)	−1.38 (0.35)^a	−0.010 (0.062)	2.04 (0.53)^a	6.47 (1.75)^a	2.95 (2.00)
Baseline sleep HR (0=38 bpm), estimate (SE)	−0.28 (0.02)^a	−0.019 (0.004)^a	0.31 (0.03)^a	1.25 (0.10)^a	0.71 (0.11)^a
Alcohol x physical activity class, estimate (SE)	−0.27 (0.17)	0.065 (0.029)^c	−0.32 (0.25)	−1.47 (0.83)	−1.59 (0.95)
Alcohol x age	−0.12 (0.03)^a	−0.009 (0.005)	0.26 (0.04)^a	−0.04 (0.14)	0.27 (0.16)
Alcohol x BMI, estimate (SE)	0.08 (0.08)	−0.009 (0.014)	−0.15 (0.12)	−0.39 (0.39)	−1.05 (0.45)^c
Alcohol x gender, estimate (SE)	−0.56 (0.60)	0.251 (0.104)^c	−0.13 (0.89)	1.35 (2.95)	4.87 (3.37)
Alcohol x baseline sleep HR, estimate (SE)	−0.08 (0.03)^c	−0.005 (0.005)	0.18 (0.05)^a	0.83 (0.15)^a	0.30 (0.17)
Adjusted coefficient of determination for the model	0.271	0.042	0.255	0.236	0.137

^aP<.001.

^bP<.01.

^cP<.05.