Reported percentage time using tools and at environment parameters
| All subjects | No. of subjects | Mean % time (SD) | Bias | 95% CI of the bias | (%) accuracy | |
|---|---|---|---|---|---|---|
| Activity card | Questionnaire | |||||
| Tools | ||||||
| Chopsaw | 8 | 0.4 (0.6) | 2.1 (4.3) | −1.7 | −5.4 to 2.0 | 95 |
| Hammer/mallet/sledge/nailgun | 16 | 32.0 (37.6) | 26.7 (35.6) | 4.9 | −5.5 to 15.3 | 78 |
| Hand power saw | 16 | 17.7 (21.5) | 16.3 (22.6) | 1.4 | −6.9 to 9.6 | 83 |
| Other hand power tool | 16 | 0.4 (0.8) | 3.7 (9.6) | −3.3 | −8.0 to 1.5 | 90 |
| Other tool | 8 | 30.3 (32.6) | 11.7 (29.0) | 18.7 | −3.4 to 40.8 | 77 |
| Powder actuated tool | 12 | 0.1 (0.5) | 0 (0 | 0.1 | −0.2 to 0.4 | 99 |
| Rotohammer | 16 | 9.5 (14.5) | 15.3 (21.7) | −5.7 | −12.4 to 1.0 | 85 |
| Screwgun/drillmotor | 16 | 20.8 (25.6) | 22.7 (29.0) | −1.9 | −17.2 to 13.4 | 69 |
| Stationary power tool | 16 | 0.5 (1.3) | 1.1 (2.7) | −0.6 | −2.1 to 1.0 | 97 |
| No. of workers | ||||||
| 3 or less | 16 | 50.3 (31.3) | 45.9 (28.5) | 4.4 | −8.4 to 17.2 | 76 |
| 4 or more | 16 | 41.7 (30.4) | 54.1 (28.5) | −12.3 | −25.6 to 0.9 | 72 |
| Environment | ||||||
| Inside | 16 | 11.3 (24.6) | 18.3 (29.1) | −7.0 | −25.5 to 11.4 | 23 |
| Partial enclosure | 16 | 34.1 (40.1) | 33.4 (33.0) | 0.7 | −19.4 to 20.7 | 62 |
| Outside | 16 | 51.0 (44.0) | 48.3 (44.3) | 2.7 | −5.8 to 11.3 | 49 |