Table 4 The statistical distribution of the evaluated items

Environmental items

Air temperature

Q11

−1 – 4

2.33

1.32

Relative humidity

Q12

0–4

1.34

1.33

Radiant temperature

Q13

0–5

2.15

1.75

Thermal conduction

Q14

-1 – 4

0.94

0.72

Air velocity

Q15

0–3

1.09

0.42

Job items

Boby movement

Q1

0–4

1.71

0.88

Physical activity

Q16

0–4

2.00

0.92

Administrative items

Heat control measures

Q2

0–4

2.62

1.39

Heat adaptation planning

Q7

0–4

1.30

1.42

Heat exposure duration

Q8

0–4

2.09

1.39

Work–rest cycle

Q9

0–4

2.79

1.37

Work location

Q10

1–3

1.66

0.92

Clothing items

Material

Q3

1–5

2.02

0.94

Thickness

Q4

1–4

1.90

0.59

Type

Q5

1–5

2.17

0.69

Personal protective equipment

Q6

0–6

1.22

1.17