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| First-level indicators | Second-level indicators | Example |
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| Human factors (A) | Work attitude (A1) | Inactivity, inattention, not satisfied with the status quo, feel being treated unfairly, not following the rules, and not operating equipment as required |
| Body condition (A2) | Poor health, depression, working long hours, high intensity of work causing poor mental state |
| Professional skill (A3) | Degree of education, years of working, special professional skill level, knowledge of training, operation proficiency |
| Safety consciousness (A4) | Improper use of safety devices, entering the construction site without safety helmet, noncompliance with defined operational procedures |
| Psychological quality (A5) | Keep calm when facing hazardous conditions and resist pressure to remedy or to get out of dilemma |
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| Material factors (B) | Material quality (B1) | Defective material |
| Storage condition (B2) | Dangerous goods are not stored according to regulations |
| Sorting status (B3) | Waste materials are not disposed of in time |
| Applicability feasibility (B4) | The material does not meet the requirements of the construction site |
| Effectiveness (B5) | Material life cycle, performance, and durability cannot achieve the desired effect or their role cannot be fully played |
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| Equipment factors (C) | Equipment selection (C1) | Poor equipment performance leads to failure to meet construction requirements |
| Running state (C2) | Poor equipment quality means it is fault-prone when running, problems with accessories |
| Maintenance condition (C3) | No regular inspection to detect and resolve failures, no regular maintenance |
| Protective measures (C4) | No safety precautions put in place for the equipment |
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| Management factors (D) | Previous preparation (D1) | The construction plan draft in the early stage is not in line with the actual situation, distribution of resources and labor forces is inappropriate, no rigorous safety system is established, unclear assignment of responsibility and authority |
| Safety facilities (D2) | No technical measures are taken to reduce the risk factors, such as occupational disease and unreasonable use of electricity |
| Safety education (D3) | No regular safety education is organized for workers corresponding their position |
| Safety check (D4) | No regular inspection of the construction environment and safety facilities |
| Technical clarification (D5) | No safe technical disclosure before construction is carried out by management and construction personnel |
| Emergency measures (D6) | No reasonable emergency plan for site safety hazard made |
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| Environmental factors (E) | Geographical environment (E1) | Mainly including special soil quality, water quality, and karst cave |
| Underground pipeline (E2) | Various pipelines laid below ground level, such as gas pipes, sewage pipes, and power pipes |
| Surrounding buildings (E3) | Residential buildings, commercial buildings, and industrial buildings around the site may cause excessive Earth pressure |
| Weather effect (E4) | During the construction process, the rain, snow, and wind may cause safety hazard |
| Working environment (E5) | Defects in temperature, light intensity, air quality, noise, and so on |
| Traffic condition (E6) | Too much traffic will cause the surrounding road to vibrate |
| Construction condition (E7) | The site layout is not appropriate, debris piled up resulting in small working space |
| Site safety facilities (E8) | The safety devices which contain fine mesh safety vertical net, danger signs, inward and outward signs, and so on are not installed reasonably |
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