Table 3 Comparison of intracranial and extracranial parameters related to diastole and systole flow in young and elderly healthy adults

n

28

20

14

14

6

14

E. CC duration (ms)

832 ± 158 (100%)

820 ± 111 (100%)

0.79

876 ± 193

788 ± 102

0.35

860 ± 122

803 ± 106

0.31

I. CC duration (ms)

831 ± 150 (100%)

850 ± 118 (100%)

0.29

869 ± 176

793 ± 113

0.39

941 ± 108

811 ± 101

0.02^*

Systole

E. duration (ms)

360 ± 29

(44%)

364 ± 47

(45%)

0.71

363 ± 25

358 ± 34

0.68

361 ± 29

365 ± 54

0.87

I. duration (ms)

357 ± 32

(44%)

365 ± 43

(43%)

0.49

359 ± 31

355 ± 33

0.77

387 ± 64

356 ± 29

0.15

p = .59

p = .61

p = .64

p = .78

p = .25

p = .47

E. mean flow (ml/min)

843 ± 153

816 ± 172

0.57

797 ± 142

889 ± 154

0.11

852 ± 207

800 ± 161

0.55

I. mean flow (ml/min)

774 ± 154

809 ± 143

0.43

736 ± 138

812 ± 165

0.20

839 ± 171

796 ± 135

0.55

p = < 0.001***

p = .84

p = .03*

p = .002**

p = .87

p = .91

Diastole

E. duration (ms)

472 ± 145

(56%)

456 ± 106

(55%)

0.85

513 ± 178

431 ± 90

0.36

498 ± 134

438 ± 92

0.26

I. duration (ms)

474 ± 131

(56%)

485 ± 99

(57%)

0.47

510 ± 151

437 ± 100

0.21

554 ± 111

455 ± 80

0.04^*

p = .54

p = .06

p = .91

p = .45

p = .02*

p = .38

E. mean flow (ml/min)

628 ± 128

457 ± 111

< 0.001^***

587 ± 120

669 ± 126

0.09

472 ± 143

451 ± 99

0.70

I. mean flow (ml/min)

599 ± 121

473 ± 100

< 0.001^***

571 ± 118

627 ± 123

0.23

482 ± 115

470 ± 97

0.81

p = .03*

p = .36

p = .42

p = .02*

p = .81

p = .34