Table 1 Demographics and participant characteristics

Sex

0.18

 Male (n (%))

35 (75)

7 (54)

42 (70)

 Female (n (%))

12 (25)

6 (46)

18 (30)

Age at event (years)

33 (19–65)

33 (20–57)

33 (19–65)

0.74

Height (cm)

183 (165–204)

173 (156–193)

182 (156–204)

0.033

Weight (kg)

75 (50–108)

65 (55–91)

75 (50–108)

0.41

BMI (kg/m²)

23.3 (19.8–31.3)

21.9 (18.4–27.5)

22.6 (18.4–31.1)

0.17

Ethnicity (n (%))

0.55

 Caucasian

43 (92)

13 (100)

56 (93)

 Asian

3 (6)

0 (0)

3 (5)

 Afro-Caribbean

1 (2)

0 (0)

1 (2)

Background (n (%))

0.67

 Recreational athlete

40 (85)

12 (92)

52 (87)

 Professional athlete

0 (0)

0 (0)

0 (0)

 Military personnel

7 (15)

1 (8)

8 (13)

Medical (family) history (n)

Yes

No

Yes

No

Yes

No

NR

 Neurological/neuromuscular

–

47

–

13

–

60

–

–

 Endocrine

–

47

1

12

1

59

–

–

 Cardiovascular

–

47

–

13

–

60

–

–

 Previous episode of EHS

3

44

–

6

3

50

7

1.00

 Previous episode of ERM

–

31

6

7

6

38

16

< 0.001

 Family history of ERM

–

35

1

10

1

45

14

0.23