Table 1. Statistics for carrying distances and temporal dynamics in the three types of workers: excavators, short-distance carriers and long-distance carriers.
| Worker type | N | Mean distance (cm) | Regression estimate (cm/h) |
| First day | |||
| Excavators | 60 | 9.6A (7.6 to 11.6) | 0.53NS (−0.33 to 1.32) |
| Short-distance carriers | 168 | 16.2A (7.9 to 28.1) | 0.71NS (−4.80 to 6.26) |
| Long-distance carriers | 60 | 149.3B (128.9 to 165.3) | 1.98NS (−7.11 to 9.47) |
| Second day | |||
| Excavators | 73 | 9.7A (8.1 to 11.4) | −0.07NS (−0.82 to 0.75) |
| Short-distance carriers | 113 | 18.0A (8.4 to 33.0) | −0.58NS (−5.42 to 5.12) |
| Long-distance carriers | 73 | 164.1B (146.2 to 177.6) | 2.13NS (−4.83 to 8.13) |
Shown are the number of observations, mean distance, and slope of the relationship between carrying distance and time, for the first and the second day separately. The 95% confidence interval for the means and the 98.3% confidence interval for the slopes, both determined by bootstrapping, are indicated in parentheses. Mean values with non-overlapping confidence intervals are considered significantly different. Values sharing the same letter are not significantly different. Slopes are considered significant if their confidence intervals do not include zeros. Significance levels are indicated in superscripts (‘NS’: not significant).