Table 5 The effect coefficients of the items

Environmental items

Air temperature

Q11

0.903

0.727

P < 0.001

Relative humidity

Q12

0.606

0.488

Radiant temperature

Q13

0.836

0.673

Thermal conduction

Q14

0.799

0.643

Air velocity

Q15

0.685

0.551

Factor score

–

0.860

0.805

Job items

Boby movement

Q1

0.880

0.542

P < 0.001

Physical activity

Q16

0.880

0.542

Factor score

–

0.658

0.616

Administrative items

Heat control measures

Q2

0.918

0.673

P < 0.001

Heat adaptation planning

Q7

0.619

0.454

Heat exposure duration

Q8

0.901

0.660

Work–rest cycle

Q9

0.781

0.572

Work location

Q10

0.717

0.526

Factor score

–

0.783

0.733

Clothing items

Material

Q3

0.906

0.480

P < 0.001

Thickness

Q4

0.941

0.500

Type

Q5

0.887

0.470

Personal protective equipment

Q6

0.859

0.460

Factor score

–

0.566

0.530

–

0.936

–

P < 0.001