Table 2.
Total recording time and variables describing exposure levels and frequency of changes in exposure as defined in Table 1; in total and amongst male and female call centre operators.
| Difference males-females |
|||||
|---|---|---|---|---|---|
| Variable |
All N = 140 |
Males N = 43 |
Females N = 97 |
Difference | p-value1 |
| Recording time | Total recording time (hours) | ||||
| Mean | 5.84 | 5.91 | 5.81 | 0.09 | 0.650 |
| Median | 5.98 | 6.02 | 5.93 | 0.09 | |
| sd | 1.13 | 1.25 | 1.07 | ||
| Range | 1.49-8.83 | 1.49-8.83 | 3.00-8.54 | ||
| LEV1 | Proportion in seated posture (%) | ||||
| Mean | 74.9 | 74.1 | 75.3 | -1.1 | 0.477* |
| Median | 80.6 | 80.5 | 80.8 | -0.3 | |
| sd | 16.6 | 17.3 | 16.3 | ||
| Range | 6.2-95.4 | 6.2-93.3 | 15.9-95.4 | ||
| FREQ1 | Frequency of posture switches (per hour) | ||||
| Mean | 10.4 | 11.5 | 9.9 | 1.5 | 0.090 |
| Median | 9.9 | 11.3 | 8.8 | 2.5 | |
| sd | 4.9 | 4.7 | 4.9 | ||
| Range | 2.5-25.4 | 2.5-21.2 | 3.2-25.4 | ||
| FREQ2 | Average duration of seated periods (min) | ||||
| Mean | 11.2 | 9.8 | 11.8 | -1.9 | 0.114 |
| Median | 9.9 | 8.7 | 10.5 | -1.8 | |
| sd | 6.7 | 6.5 | 6.7 | ||
| Range | 0.5-39.5 | 0.5-39.5 | 1.9-33.8 | ||
| FREQ3 | Average duration of standing/walking periods (min) | ||||
| Mean | 3.1 | 2.8 | 3.3 | -0.5 | 0.498* |
| Median | 2.6 | 2.3 | 2.6 | -0.3 | |
| sd | 2.3 | 1.7 | 2.6 | ||
| Range | 0.8-18.7 | 0.9-8.0 | 0.8-18.7 | ||
| FREQ4 | Per cent of time in uninterrupted seated periods > 1 hour | ||||
| Mean | 9.1 | 4.6 | 11.1 | -6.6 | 0.013* |
| Median | 0.0 | 0.0 | 0.0 | 0.0 | |
| sd | 15.7 | 11.4 | 16.9 | ||
| Range | 0.0-78.8 | 0.0-43.9 | 0.0-78.8 | ||
| FREQ5 | Per cent of time in uninterrupted stand/walk periods > 1 hour | ||||
| Mean | 1.9 | 1.5 | 2.0 | -0.6 | 0.386* |
| Median | 0.0 | 0.0 | 0.0 | 0.0 | |
| sd | 6.6 | 6.9 | 6.5 | ||
| Range | 0.0-36.5 | 0.0-36.5 | 0.0-27.7 | ||
1 Two-tailed t-tests or Mann-Whitney test (*) if significant deviation from normal distribution. Boldface p-values indicate a significant difference (p < 0.05).