Table 2 Demographic characteristics and outcomes by bystander type

Age category

65–74 years

15,854

27.5

7,485

26.7%

0.011

75–84 years

24,032

41.7

9,800

35.0%

<0.001

85 years and over

17,679

30.7

10,738

38.3%

<0.001

Initial cardiac rhythm

VF/VT

6,361

11.1

3,616

12.9%

<0.001

PAD performed

72

0.1

408

1.5%

<0.001

Bystander performed CPR

Non

37,112

64.5

11,152

39.8%

<0.001

Chest compression only

12,881

22.4

7,402

26.4%

<0.001

M-to-M ventilation only

792

1.4

368

1.3%

0.468

Conventional CPR

6,780

11.8

9,101

32.5%

<0.001

1-Month outcomes

Survival

3,548

6.2

2,377

8.5%

<0.001

Favorable CPC

1,292

2.2

1,110

4.0%

<0.001

Interval

Min

SD

Min

SD

Call–arrival of EMS

7.5

3.9

7.1

3.7

<0.001

Collapse–bystander CPR

4.8

6.9

2.0

4.2

<0.001

Collapse–call

5.6

7.8

4.9

6.6

<0.001