TABLE 2.

Comparison of Ventricular Arrhythmias by Time of Day

	Time of Day	n (%)	OR (95% CI)*
Total events* (ICD/ILR/Holter)	6 am-11:59 am	48 (14.8)	Ref.
	12 pm-5:59 pm	128 (39.4)	2.54 (1.69-3.83)
	6 pm-11:59 pm	149 (45.9)	2.91 (1.82-4.67)
ICD/ILR*	6 am-11:59 am	38 (13.4)	Ref.
	12 pm-5:59 pm	106 (37.5)	2.73 (1.66-4.49)
	6 pm-11:59 pm	139 (49.1)	3.55 (1.99-6.33)
Male†	6 am-11:59 am	21 (14.0)	Ref.
	12 pm-5:59 pm	62 (41.3)	2.49 (1.23-5.03)
	6 pm-11:59 pm	67 (44.7)	2.72 (1.32-5.61)
Female†	6 am-11:59 am	27 (15.4)	Ref.
	12 pm-5:59 pm	66 (37.7)	2.43 (1.57-3.77)
	6 pm-11:59 pm	82 (46.9)	3.01 (1.69-5.34)
Age <10 yrs‡	6 am-11:59 am	16 (18.6)	Ref.
	12 pm-5:59 pm	45 (52.3)	2.81 (1.89-4.19)
	6 pm-11:59 pm	25 (29.1)	1.56 (0.93-2.62)
Age 10-15 yrs‡	6 am-11:59 am	8 (10.0)	Ref.
	12 pm-5:59 pm	39 (48.8)	4.87 (1.96-12.14)
	6 pm-11:59 pm	33 (41.3)	4.12 (1.59-10.67)
Age >15 yrs‡	6 am-11:59 am	24 (15.1)	Ref.
	12 pm-5:59 pm	44 (27.7)	1.83 (1.00-3.37)
	6 pm-11:59 pm	91 (57.2)	3.79 (2.05-7.01)
Weekday (ICD/ILR)*	6 am-11:59 am	27 (14.0)	Ref.
	12 pm-5:59 pm	70 (36.3)	2.56 (1.54-4.23)
	6 pm-11:59 pm	96 (49.7)	3.47 (1.89-6.36)
Weekend/holiday (ICD/ILR)*	6 am-11:59 am	11 (12.2)	Ref.
	12 pm-5:59 pm	36 (40.0)	3.30 (1.52-7.17)
	6 pm-11:59 pm	43 (47.8)	3.96 (1.81-8.69)

Total events include ICD, ILR, Holter.

^*Adjusted by age, sex, and multicenters.

^†Adjusted by age and multicenters.

^‡Adjusted by sex and multicenters.

CI = confidence interval; ILR = implantable loop recorder; OR = odds ratio; Ref. = reference; other abbreviation as in Table 1.