Table 2

Comparison of Ventricular Arrhythmias by Time of Day

Time of Dayn (%)OR (95% CI)
Total events (ICD/ILR/Holter)6 am–11:59 am
12 pm–5:59 pm
6 pm–11:59 pm
48 (14.8)
128 (39.4)
149 (45.9)
Ref.
2.54 (1.69–3.83)
2.91 (1.82–4.67)
ICD/ILR6 am–11:59 am38 (13.4)Ref.
12 pm–5:59 pm106 (37.5)2.73 (1.66–4.49)
6 pm–11:59 pm139 (49.1)3.55 (1.99–6.33)
Male6 am–11:59 am21 (14.0)Ref.
12 pm–5:59 pm62 (41.3)2.49 (1.23–5.03)
6 pm–11:59 pm67 (44.7)2.72 (1.32–5.61)
Female6 am–11:59 am27 (15.4)Ref.
12 pm–5:59 pm66 (37.7)2.43 (1.57–3.77)
6 pm–11:59 pm82 (46.9)3.01 (1.69–5.34)
Age <10 yrs6 am–11:59 am16 (18.6)Ref.
12 pm–5:59 pm45 (52.3)2.81 (1.89–4.19)
6 pm–11:59 pm25 (29.1)1.56 (0.93–2.62)
Age 10–15 yrs6 am–11:59 am8 (10.0)Ref.
12 pm–5:59 pm39 (48.8)4.87 (1.96–12.14)
6 pm–11:59 pm33 (41.3)4.12 (1.59–10.67)
Age >15 yrs6 am–11:59 am24 (15.1)Ref.
12 pm–5:59 pm44 (27.7)1.83 (1.00–3.37)
6 pm–11:59 pm91 (57.2)3.79 (2.05–7.01)
Weekday (ICD/ILR)6 am–11:59 am27 (14.0)Ref.
12 pm–5:59 pm70 (36.3)2.56 (1.54–4.23)
6 pm–11:59 pm96 (49.7)3.47 (1.89–6.36)
Weekend/holiday (ICD/ILR)6 am–11:59 am
12 pm–5:59 pm
6 pm–11:59 pm
11 (12.2)
36 (40.0)
43 (47.8)
Ref.
3.30 (1.52–7.17)
3.96 (1.81–8.69)

Total events include ICD, ILR, Holter.

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

  • Adjusted by age, sex, and multicenters.

  • Adjusted by age and multicenters.

  • Adjusted by sex and multicenters.