Reported percentage time at tasks
| Tasks by trade | No. of subjects | Mean % time (SD) | Bias | 95% CI of the bias | (%) accuracy | |
|---|---|---|---|---|---|---|
| Activity card | Questionnaire | |||||
| *Significantly different from zero at the 0.05 level, 95% confidence intervals do not include zero. | ||||||
| All subjects | ||||||
| Break/rest/clean up | 16 | 8.3 (3.6) | 12.7 (5.9) | −4.4* | −1.2 to −7.6 | 93 |
| Manual material handling | 15 | 4.9 (7.3) | 10.1 (12.1) | −5.2 | −11.1 to 0.7 | 87 |
| Work vehicle operation | 15 | 0.5 (1.0) | 4.2 (8.1) | −3.6 | −7.6 to 0.4 | 91 |
| Carpenter | ||||||
| Build gang form | 8 | 49 (30) | 30 (27) | 18.8* | 10.0 to 27.5 | 78 |
| Layout | 8 | 3.2 (6.2) | 8.9 (9.3) | −5.7 | −11.6 to 0.3 | 91 |
| Other carpenter task | 8 | 15.0 (19.3) | 10.3 (9.1) | 4.7 | −10.8 to 20.1 | 81 |
| Place concrete | 8 | 7.1 (20.1) | 10.3 (29.3) | −3.3 | −10.9 to 4.4 | 90 |
| Shop work | 8 | 1.8 (4.8) | 3.1 (8.3) | −1.3 | −4.2 to 1.7 | 96 |
| Wood framing | 8 | 5.2 (7.5) | 13.7 (18.4) | −8.5 | −20.0 to 2.9 | 84 |
| Electrician | ||||||
| Install cable tray | 4 | 1.9 (2.2) | 0 (0) | 2.0 | −1.7 to 5.5 | 97 |
| Install slab conduit | 4 | 9.1 (18.1) | 22.8 (37.4) | −13.7 | −85.3 to 57.9 | 53 |
| Install trench conduit | 4 | 9.8 (18.0) | 13.2 (20.0) | −3.4 | −10.0 to 3.1 | 95 |
| Install wall conduit | 4 | 18.6 (29.8) | 20.7 (28.0) | −2.1 | −14.2 to 10.1 | 92 |
| Other electrician task | 4 | 6.0 (11.2) | 1.5 (2.9) | 4.4 | −15.2 to 24.1 | 87 |
| Panel wire/fixture installation | 4 | 6.5 (5.1) | 0 (0) | 6.5 | −1.7 to 14.6 | 92 |
| Pull wire | 4 | 36.1 (39.5) | 14.2 (10.5) | 21.9 | −36.0 to 79.8 | 58 |
| Sheet metal work | 4 | 0.2 (0.4) | 0 (0) | 0.2 | −0.4 to 0.8 | 100 |
| Sheet metal | ||||||
| Fabricate metal products | 2 | 2.3 (3.7) | 30.0 (42.4) | −27.4 | −375.6 to 320.8 | 53 |
| Install metal products | 2 | 73.7 (11.7) | 70.3 (15.9) | 3.7 | −34.0 to 41.3 | 94 |
| Other sheet metal task | 2 | 0.4 (0.5) | 0 (0) | 0.4 | −4.5 to 5.2 | 100 |
| Labourer | ||||||
| Flagging | 1 | 93 | 64 | 29 | – | |
| Operating engineer | ||||||
| Backhoe operation | 1 | 93 | 89 | 5 | – | |