Mean time (in minutes) and standard deviation (SD) of tasks performed by Dutch traditional working bricklayers (n = 10) and bricklayers’ assistants (n = 10) and as a percentage of total working time over a standardised observation period of 4.5 hours5,6
| Tasks | Bricklayer | Bricklayers’ assistant | ||||
|---|---|---|---|---|---|---|
| Mean (min) | (SD) | % | Mean (min) | (SD) | % | |
| Bricklaying | 135.0 | (13.2) | 50 | 0.4 | (1.0) | 0.1 |
| Preparation | 49.6 | (12.3) | 18.4 | 40.0 | (47.4) | 14.8 |
| Removing mortar | 24.4 | (9.3) | 9.0 | 7.7 | (17.2) | 2.9 |
| Consultation | 2.6 | (2.1) | 1.0 | 11.6 | (9.8) | 4.3 |
| Cleaning | 2.5 | (2.8) | 0.9 | 7.7 | (13.9) | 2.9 |
| Breaks | 35.9 | (4.9) | 13.3 | 38.7 | (7.3) | 14.3 |
| Intermediate task | 1.1 | (2.1) | 0.4 | 1.8 | (2.7) | 0.6 |
| Micro pauses | 12.3 | (11.5) | 4.6 | 19.9 | (12.3) | 7.4 |
| Transportation of materials | 4.6 | (4.1) | 1.7 | 141.4 | (60.1) | 52.4 |
| Other, undefined tasks | 2.0 | (1.5) | 0.7 | 0.8 | (1.1) | 0.3 |
| Total | 270 | 100 | 270 | 100 | ||