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Table 1 Age-standardized prevalence of ECG abnormalities in Lithuanian population aged 40–64 years

From: Trends in electrocardiographic abnormalities and risk of cardiovascular mortality in Lithuania, 1986–2015

Prevalence of ECG abnormalities

Study years

P from chi squared

1986–1987

1992–1993

1999–2002

2006–2008

Men (n)

1496

926

1119

1886

 

 Q - QS codes, %

4.1

3.8*

2.5*

2.1a

0.002

 Left axis deviation, %

4.3*

5.5*

3.3

5.2*

0.048

 ST-T codes, %

6.3*

3.8a, *

5.0*

5.1

0.057

 High R waves, %

6.3*

5.8*

9.0a, b, *

9.5a, b, *

< 0.001

 Arrhythmia, %

5.3

5.9

4.7*

4.4*

0.295

 Blocks, %

1.4

1.4*

1.8*

1.8*

0.729

 Definite myocardial infarction, %

1.2*

1.0*

0.8*

0.5*

< 0.001

 Possible myocardial infarction, %

1.2

1.1

0.7

0.7*

 

 Left ventricular hypertrophy, %

3.1

4.0*

6.3 a, *

5.8 a, *

 

 Ischemia, %

5.9*

4.0*

4.0*

4.7

 

 Marginal abnormalities or absent, %

88.6*

89.8

88.1

88.3*

 

Women (n)

1609

1114

1415

2339

 

 Q - QS codes, %

3.2

1.8

1.1a

2.1

< 0.001

 Left axis deviation, %

2.8

2.8

2.2

2.7

0.696

 ST-T codes, %

12.9

7.7a

9.1a

5.9a, c

< 0.001

 High R waves, %

4.2

2.7

3.7

3.5

0.233

 Arrhythmia, %

4.8

4.2

2.6a

3.1a

0.004

 Blocks, %

0.7

0.5

0.6

0.8

0.869

 Definite myocardial infarction, %

0.4

0.0

0.2

0.2

< 0.001

 Possible myocardial infarction, %

1.4

0.6

0.4a

1.4c

 

 Left ventricular hypertrophy, %

2.6

1.7

2.1

2.2

 

 Ischemia, %

12.3

8.2a

8.4a

5.9a, c

 

 Marginal abnormalities or absent, %

83.2

89.5a

88.9a

90.3a

 
  1. ap < 0.05 compared to 1986–1987, Bonferroni test. bp < 0.05 compared to 1992–1993, Bonferroni test. cp < 0.05 compared to 1999–2002, Bonferroni test. *p < 0.05 compared men to women
  2. ECG: electrocardiogram
  3. Bold typeface of P values indicates significance