Table 2.
Category of improvement in each group during 10 months
| Number of Improvements | IRR* | 95%CI | p value | |||
|---|---|---|---|---|---|---|
| Control group (n=28) | Intervention group (n=23) | |||||
| * Incident rate ratio. # Due to duplicate application, the number of total improvements does not match the sum of each item. The number of workers in the contorl group is 315 and the number of workers in the intervention group is 301. | ||||||
| Total improvement | 663# | 467# | 1.15 | 0.66 | 2.01 | 0.623 |
| Low back pain measures | 53 | 96 | 2.33 | 1.13 | 4.80 | 0.022 |
| Local pain measures except for the waist | 43 | 73 | 2.17 | 0.87 | 5.38 | 0.095 |
| Safety measures | 432 | 305 | 1.24 | 0.72 | 2.14 | 0.435 |
| Improvement in production efficiency | 252 | 222 | 0.88 | 0.44 | 1.77 | 0.728 |
| Quality improvement and others | 259 | 208 | 1.21 | 0.52 | 2.83 | 0.659 |