TABLE 2.

Summary of the Sample Demographics and Study Setting

Sample Demographics	n (%)	Tc ≥ 40°C (%)	EHI/Heatstroke (%)
Sport Types
Intermittent sports	295 (20.3)	4.4	2.7
American football	16 (1.1)	0	0
Association football (soccer)	50 (3.4)	6.0	0
Australian football	45 (3.1)	20.0	0
Cricket	38 (2.6)	0	21.1
Rugby union	57 (3.9)	1.8	1.8
Tennis	89 (6.1)	0	0
Endurance sports	1155 (79.7)	13.8	2.8
Adventure racing	24 (1.7)	8.3	0
Cycling	64 (4.4)	20.3	0
Racewalking	53 (3.7)	47.2	3.8
Running	838 (57.8)	16.6	0.6
Swimming	21 (0.9)	0	0
Surf Skiing	13 (0.9)	7.7	0
Triathlon	142 (9.8)	7.0	11.3
Environmental Risk Categories
Extreme-risk	170 (11.7)	8.8	7.3
High-very high risk	201 (13.9)	18.4	8.0
Moderate-high risk	220 (15.2)	18.2	1.8
Low risk	757 (52.2)	9.6	0
Low-moderate risk	249 (17.2)	4.8	1.6
Competitive Level
Amateur/recreational	20 (1.4)	0	0
Elite	411 (28.3)	15.3	8.8
Trained	901 (62.1)	11.3	0.1
Unknown	102 (7.0)	6.9	3.9
Youth	16 (1.1)	0	0
Physical Ability
Able-bodied athletes	1,399 (96.5)	11.7	1.8
Para-athletes	51 (3.5)	15.7	31.4

Note. The WBGT risk categories included; low (WBGT < 20°C), moderate-high (WBGT 21–25°C), high-very high (WBGT 26–29°C) and extreme (WBGT ≥ 30°C) [67]. While the ambient condition risk categories included; low (Ta 15–20°C), low-moderate (Ta 21–25°C; relative humidity [RH] > 70%), moderate-high (Ta 26–29°C; RH > 60%), high-very high (Ta 31–35°C; RH > 50%) and extreme (Ta ≥ 36°C; RH > 30%) [67]. The competitive level was based on how the authors reported participants in the original investigations. Key. n (participant number), Tc ≥ 40°C (incidence of core body temperature ≥ 40°C) and EHI/EHS (number of individuals reported with at least one symptom of exertional heat illness/heatstroke).