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Table 1 Selected studies of normal ECG intervals

From: Normal limits of the electrocardiogram derived from a large database of Brazilian primary care patients

Study

Population

Year

Patients (n)

ECG acquisition

Sampling rate

Analytic program

Percentiles

Rijnbeek et al.

0 to 16 y; Dutch

2001

Male (944); Female (968)

Cardio Control (Delft, Netherlands)

1200 Hz

MEANSa

2nd, 50th and 98th

Wu et al.

18 to ≥ 60 y; Chinesese

2003

Male (3614); Female (1746)

Cardio Control (Delft, Netherlands)

1200 Hz

MEANSa

2nd, 50th and 98th

Mason et al.

0 to 99 years; Northern America (70%), Europe (21%), Africa (3%), Latin America (3%), and Asia (2%) and Oceania (2%).

2007

Male (14,297); Female (12,201)

MTX-2 (CCSSI); MAC 1200 (GE Medical Systems)

500 Hz

CCSSI

1st, 2nd, 50th, 98th, 99th

Rijnbeek et al.

16 to 89 y; Dutch

2014

Male (7326); Female (6028)

ACTA (ESAOTE, Florence, Italy); Cardio Perfect equipment (Welch Allyn Cardio Control, USA); Megacart (Siemens, Erlangen, Germany)

500 Hz

MEANSa

2nd, 50th and 98th

  1. aModular ECG Analysis System (MEANS)