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Table 2 Baseline characteristics of study population according to QTc (N = 7002)

From: Plasma homocysteine levels associated with a corrected QT interval

Variables

QTc ≤0.44 s (n = 4695)

QTc > 0.44 s (n = 2307)

P-value

Age (year)

53 ± 10

56 ± 11

<0.001

Male gender

2589 (55.1)

671 (29.1)

<0.001

Race of Han

4394 (93.6)

2178 (94.4)

0.179

Smoking

1905 (40.6)

732 (31.7)

<0.001

Drinking

1250 (26.6)

355 (15.4)

<0.001

Sleep duration (h/d)

7.5 ± 1.7

7.4 ± 1.7

0.029

Diet score

2.3 ± 1.2

2.1 ± 1.1

<0.001

Education

  

<0.001

 Primary school or below

2162 (46.0)

1265 (54.8)

 

 Middle school

2082 (44.3)

851 (36.9)

 

 High school or above

451 (9.6)

191 (8.3)

 

Physical activity

  

<0.001

 Low

969 (20.6)

693 (30.0)

 

 Moderate

3423 (72.9)

1476 (64.0)

 

 High

303 (6.5)

138 (6.0)

 

Family income (CNY/year)

  

<0.001

  ≤ 5000

778 (16.6)

465 (20.2)

 

 5000–20,000

2664 (56.7)

1293 (56.0)

 

  > 20,000

1253 (26.7)

549 (23.8)

 

BMI(kg/m2)

24.6 ± 3.7

25.2 ± 3.8

<0.001

WC (cm)

83.1 ± 9.8

84.5 ± 9.8

<0.001

SBP (mmHg)

139.9 ± 23.3

149.6 ± 26.3

<0.001

DBP(mmHg)

80.6 ± 11.2

84.3 ± 12.8

<0.001

FPG (mmol/L)

5.7 ± 1.4

6.1 ± 2.1

<0.001

TC (mmol/L)

5.0 ± 1.0

5.2 ± 1.1

<0.001

TG (mmol/L)

1.6 ± 1.5

1.9 ± 1.8

<0.001

LDL-C (mmol/L)

2.8 ± 0.7

2.9 ± 0.8

<0.001

HDL-C (mmol/L)

1.4 ± 0.4

1.4 ± 0.4

0.361

Serum calcium (mmol/L)

2.4 ± 0.1

2.4 ± 0.1

0.461

Serum potassium (mmol/L)

4.2 ± 0.3

4.1 ± 0.3

<0.001

Serum magnesium (mmol/L)

0.9 ± 0.1

0.9 ± 0.1

0.057

History of heart diseasea

383 (8.2)

294 (12.7)

<0.001

Medication usedb

2390 (50.9)

1439 (62.4)

<0.001

  1. Data are expressed as the mean ± SD or as n (%)
  2. Abbreviations: CNY China Yuan (1CNY = 0.157 USD), BMI body mass index, WC waist circumference, SBP systolic blood pressure, DBP diastolic blood pressure, FPG fasting plasma glucose, TC total cholesterol, TG triglyceride, LDL-C low-density lipoprotein cholesterol, HDL-C high-density lipoprotein cholesterol
  3. aIncluding coronary heart disease, arrythmia and heart failure
  4. bIndicating any self-reported medication used in the past two weeks.ps:P for category from chi-square; for continous from non-parametric test