2008

2013

n

%

95% CI

n

%

95% CI

p

Female

65

44.5

36.3 - 52.7

80

38.1

31.9 - 45.2

0.23

Male

81

55.5

43.7 - 67.3

130

61.9

54.8 - 68.1

Age in years

146

69.9

68.0 - 71.1

210

70.6

68.5 - 72.7

0.62

Days PVC1

Days PVC2

Days PVC3

Days PVC4

127

2.1

1.9 - 2.2

184

2.5

2.3 - 2.7

<0.001