Table 3. Estimated coefficients (P-values) of day-to-day variability for the average log activity counts by diagnostic subgroups and covariates compared with controls by time of day.

	Coefficients by time of day (hours)
	00:00–06:00	06:00–12:00	12:00–16:00	16:00–20:00	20:00–00:00
Covariates
Age	0.001 (0.73)	0.002 (0.17)	0.001 (0.23)	0.002 (0.07)	−0.001 (0.43)
Gender	0.073 (0.29)	−0.076 (0.19)	−0.095 (0.03)	−0.064 (0.08)	0.046 (0.30)
Medication	0.006 (0.95)	0.065 (0.42)	0.01 (0.87)	0.043 (0.40)	−0.086 (0.16)
BMI	−0.002 (0.61)	0 (0.95)	0.002 (0.46)	0.001 (0.75)	0.002 (0.46)
Mood disorder subgroups
Bipolar I	−0.008 (0.95)	0.073 (0.46)	0.169 (0.02)	0.023 (0.71)	−0.043 (0.57)
Bipolar II	0.282 (0.01)	0.099 (0.30)	0.093 (0.19)	−0.029 (0.64)	−0.096 (0.19)
Major Depression	0.175 (0.07)	−0.079 (0.33)	−0.05 (0.41)	−0.048 (0.35)	0.09 (0.41)

Abbreviation: BMI, body mass index.

Control group is treated as the reference level. Bolded values indicate significant results at 95% confidence level.