Table 3 Multiple logistic regression for associations between quartiles of serum electrolytes and QTc prolongation

 Quartile1

<140.0

Reference

Reference

Reference

 Quartile2

140.0-140.9

0.89

0.63

1.24

0.84

0.53

1.34

1.00

0.61

1.65

 Quartile3

141.0-141.9

0.61 ^*

0.43 ^*

0.87 ^*

0.47 ^*

0.28 ^*

0.80 ^*

0.83

0.50

1.37

 Quartile4

> 142.0

0.83

0.62

1.11

0.67

0.44

1.03

1.11

0.72

1.72

 Quartile1

<4.00

1.72 ^*

1.30 ^*

2.28 ^*

1.67 ^*

1.10 ^*

2.54 ^*

2.02 ^*

1.36 ^*

3.01 ^*

 Quartile2

4.00-4.19

1.32

0.98

1.78

1.19

0.77

1.85

1.54 ^*

1.01

2.35

 Quartile3

4.20-4.39

1.04

0.76

1.43

0.85

0.53

1.37

1.27

0.83

1.95

 Quartile4

> 4.40

Reference

Reference

Reference

 Quartile1

<2.24

Reference

Reference

Reference

 Quartile2

2.24-2.32

1.30

0.94

1.79

1.60

0.99

2.60

1.09

0.70

1.70

 Quartile3

2.33-2.41

1.28

0.92

1.78

1.41

0.85

2.34

1.19

0.76

1.86

 Quartile4

> 2.42

1.30

0.92

1.83

1.16

0.68

1.99

1.40

0.89

2.22

 Quartile1

<0.80

Reference

Reference

Reference

 Quartile2

0.80-0.83

1.33

0.91

1.95

1.83

0.97

3.46

1.13

0.70

1.83

 Quartile3

0.84-0.89

1.88 ^*

1.20 ^*

2.93 ^*

4.06 ^*

2.00 ^*

8.22 ^*

1.05

0.58

1.91

 Quartile4

> 0.90

1.55 ^*

1.06 ^*

2.26 ^*

2.47 ^*

1.32 ^*

4.64 ^*

1.21

0.74

1.96