Appendix Table 6.

Papers selected using the second search strategy

Papers selected using search strategy N.2
Paper	Year	Country/Region	Population	Heat exposure index	Study design	Main results
Adam-Poupart 1 et al (1)	2015	Canada	Working population	Maximum daily outdoor temperature	Ecological	The relationship between daily counts of compensations and maximum daily temperatures reached statistical significance for three health regions. The incidence rate ratio of daily compensations per 1°C increase was 1.002 (95%CI 1.002 to 1.003).
Bonafede et al (2)	2016	Global	Working population	Daily maximum temperature daily mean temperature or apparent temperature	Systematic review	Only 2 studies analysed the dose-response relationship between temperature and the health outcomes finding a reversed U-shaped exposure-response relationship, or linear relationship or linear above/below a threshold.
Dutta et al (3)	2015	India	Construction	WBGT	Cross-sectional	Injuries reported in summer were among workers with < 36 months of experience.
Garzon-Villalba et al (4)	2016	USA	Working population	WBGTmax	Incidence	Acute injuries (AI) were higher in workers exposed above a WBGTmax of 20°C (RR 1.06/°C). The unadjusted model showed a 13% increment in risk to experience an AI when the ambient thermal conditions increase 1°C-WBGT.
McInnes et al (5)	2017	Australia	Working population	Maximum daily temperature and minimum daily temperature (minimum temperature during the night before the day of injury)	Case-crossover	Significant positive associations between temperature and acute injury were seen for younger workers, with the odds of injury increasing by 1% for each 1°C increase in daily minimum temperature, and by 0.8% for each 1°C increase in daily maximum temperature.
Morabito et al (6)	2006	Italy (Tuscany)	Working population	Apparent temperature (AT) AT max, AT24 and AT day were assessed	Ecological	The peak of work-related accidents occurred on days characterized by high, but not extreme, thermal conditions. The maximum peak of work accidents in each month occurred on days characterized by a mean ATday ranging between 24.8°C and 27.5 °C.
Nag et al (7)	2001	India	Manufacturing industry	Ambient temperature	Case surveillance	Accident prevalence was significantly high in the summer months (May-June) when the ambient temperature ranged between 42 and 48°C (hot-dry). Permanent night workers were more vulnerable and less tolerant to heat compared to the rotating day workers.
Otte-im-Kampe et al (8)	2016	High-income countries	General population, including working population	Not specified	Systematic review	Two out of 3 studies found an increase in work-related accidents during increased temperatures; the other reported no association.
Rameezdeen et al (9)	2017	Australia	Construction	Daily maximum and minimum temperatures	Case-crossover	The number of accidents reported during heat wave periods was less compared to control periods, suggesting some control measures are in operation in construction sites to prevent accidents during heat waves
Spector et al (10)	2016	USA	Agriculture	Maximum daily humidex exposures	Case-crossover	The traumatic injury OR was 1.14 (95% CI 1.06, 1.22), 1.15 (95% CI 1.06, 1.25), and 1.10 (95% CI 1.01, 1.20) for daily maximum humidex of 25±29, 30±33, and ≥34, respectively, compared to < 25, adjusted for self-reported duration of employment.
Tawatsupa et al (11)	2013	Thailand	Working population	Experiences of heat stress derived from survey question	Cohort	Nearly 20% of workers experienced occupational heat stress, which strongly and significantly associated with occupational injury (adjusted OR 2.12, 95%CI 1.87-2.42 for males and 1.89, 95%CI 1.64-2.18 for females).
Withen (12)	2015	North America	Firefighters	Not specified	Narrative review	The trend in fatalities follows that of climate change, with a general upward trend in deaths from the 1980s to the present.
Xiang et al (13)	2014	Australia	Working population	Daily maximum temperature	Ecological	A reversed U-shaped exposure-response relationship between Tmax and overall daily injury claims was observed. Overall, a 1°C increase in maximum temperature between 14.2°C and 37.7°C was associated with a 0.2% increase in daily injury claims.
Xiang et al (14)	2014	Australia	Working population	Daily maximum and minimum temperatures	Time-series	The mean Tmax during heat waves was 38.8 °C. Daily claims increased significantly by 6.2% during heatwaves for outdoor industries. Burns, wounds, lacerations, amputations and HRI were significantly associated with heatwaves.
Xiang et al (15)	2014	Global	Working population	25 (60%) studies used WGBT, 7 (16%) used subjective heat stress and 6 %14%) used air temperature	Systematic review	Manual workers are at risk of heat stress, especially those in LMIC; 79% of identified studies indicated that participants were suffering from heat strain, with outdoor workplaces (90%) being much higher than indoor workplaces (65%).