Table 1 The guidance of scoring the factors
| Factor | Scoring | Factor | Scoring | |
|---|---|---|---|---|
| Posture group A | Assessing the most worst and frequent positions related to neck, trunk, and legs during work time and calculating score A using the table of REBA method. | Static activity |
- Never (0) - Little (1) - Sometimes (2) - Much (3) - Very much (4) | |
| Posture group B | Assessing the most worst and frequent positions related to upper arm, lower arm, and wrist during work time and calculating score B using the table of REBA method. | Repetitive activity |
- Never (0) - Little (1) - Sometimes (2) - Much (3) - Very much (4) | |
| Coupling status |
- Very good (0) - Good (1) - Acceptable (2) - Poor (3) - Very poor (4) | Rapid and sudden movement |
- Never (0) - Little (1) - Sometimes (2) - Much (3) - Very much (4) | |
| Contact stress |
- Never (0) - Little (1) - Sometimes (2) - Much (3) - Very much (4) | Throwing motion (such as hitting with a hammer or hand) |
- Never (0) - Little (1) - Sometimes (2) - Much (3) - Very much (4) | |
| Load | Maximum load weight |
- Less than 5 kg (0) - 5 to 10 kg (1) - 10 to 15 kg (2) - 15 to 20 kg (3) - More than 20 kg (4) | Hand-arm vibration |
- Never (0) - Little (1) - Sometimes (2) - Much (3) - Very much (4) |
| Load-carrying time |
- Never (0) - Less than 2 h (1) - 2 to 4 h (2) - 4 to 6 h (3) - More than 6 h (4) | Whole-body vibration |
- Never (0) - Little (1) - Sometimes (2) - Much (3) - Very much (4) | |
| Force | Maximum force value |
- Less than 1 kg (0) - 1 to 2 kg (1) - 2 to 4 kg (2) - 4 to 6 kg (3) - More than 6 kg (4) | Air temperature |
- Neutral (0) - Slightly warm or cool (1) - Warm or cool (2) - Hot or cold (3) - Very hot or very cold (4) |
| Work time |
- Less than 2 h (0) - 2 to 4 h (1) - 4 to 6 h (2) - 4 to 8 h (3) - More than 8 h (4) | Work – rest cycle (rest duration per two hours) |
- Without rest (4) - 15 min (3) - 30 min (2) - 45 min (1) - 60 min and more (0) | |