Table 1 Data from 90 calls using mobile phone videoconferencing for communication between volunteers and an emergency medical dispatch centre in a simulated medical emergency

a: Demographics of the 90 volunteered participants.

Age, median (min, max)

32.5 (14, 78)

34.0 (15, 75)

28.0 (21, 66)

31.0 (14, 78)

0.839²

Female volunteers (n (%))

8 (27)

13 (43)

12 (40)

33 (37)

0.366

Volunteers who has called an EMD center previously (n (%))

12 (40)

13 (43)

12 (40)

37 (41)

0.955

Volunteers with college or university degree (n (%))

18 (60)

18 (60)

21 (70)

57 (63)

0.042*

b: Number of elements correctly registered by EMD operator. When calculating p value the top three alternatives where combined.

No elements (n (%))

0 (0)

0 (0)

0 (0)

0 (0)

0.065

One element (n (%))

5 (17)

0 (0)

3 (10)

8 (9)

Two elements (n (%))

11 (37)

8 (27)

6 (20)

25 (28)

Three elements (n (%))

14 (46)

22 (73)

21 (70)

57 (63)

c: Sound quality as scored by EMD operator. When calculating p value the top four alternatives where combined.

Incomprehensible (n (%))

0 (0)

0 (0)

0 (0)

0 (0)

0.153

Very difficult to understand (n (%))

0 (0)

1 (3)

0 (0)

1 (1)

Somewhat difficult to understand (n (%))

0 (0)

0 (0)

2 (7)

2 (2)

Fairly easy to understand (n (%))

3 (10)

5 (17)

7 (23)

15 (17)

Very easy to understand (n (%))

27 (90)

24 (80)

21 (70)

72 (80)

d: Video quality as scored by EMD operator. When calculating p value the top two alternatives where combined.

Not able to see instructions executed (n (%))

0 (0)

1 (3)

1 (3)

2 (2)

<0.001*

Low (n (%))

0 (0)

1 (3)

8 (27)

9 (10)

Pretty low (n (%))

0 (0)

3 (10)

13 (43)

16 (18)

Pretty good (n (%))

11 (37)

7 (23)

8 (27)

26 (29)

Good (n (%))

19 (63)

18 (60)

0 (0)

37 (41)