Table 2.
Activity breakdown from self-reported diaries (30-min resolution) and matched image-based time-activity patterns (30-min resolution) collected during wave II from a subset of e-waste worker participants (n = 51)
| Self-reporteda | Image basedb | |||||
|---|---|---|---|---|---|---|
| No. of 30-min periods | Time (30-min periods) | No. of 30-min periods | Time (30-min periods) | |||
| N | Mean (SD) | Total (%) | N | Mean (SD) | Total (%) | |
| Activities | ||||||
| Burning | 7 | 4.6 (2) | 32 (9.2) | 2 | 4. (3) | 8 (2.3) |
| Dismantling | 21 | 6.9 (4) | 145 (41.5) | 11 | 4.3 (3) | 47 (13.5) |
| Sorting and loadingc | 5 | 8.0 (5) | 40 (11.5) | 10 | 2.8 (2) | 28 (8.0) |
| Buy, sell, weigh | 8 | 5.1 (3) | 41 (11.7) | 3 | 2.3 (1) | 7 (2.0) |
| Repair | NA | NA | NA | 1 | 2 (NA) | 2 (0.6) |
| Transporting materialsc | 1 | 9.0 (NA) | 9 (2.6) | 7 | 1.3 (0) | 9 (2.6) |
| Other (work) | 2 | 1.5 (1) | 3 (0.9) | 3 | 2.7 (2) | 8 (2.3) |
| Non-work or transport | 22 | 3.6 (3) | 79 (22.6) | 25 | 9.6 (8) | 240 (68.8) |
| Total | 66 | 5.3 (4) | 349 (100) | 62 | 5.6 (6) | 349 (100) |
aSelf-reported time-activity diaries (n = 51) from wave II matched with image-based time-activity data by subject ID and date time.
bImage-based time-activity patterns (n = 51) from wave II matched with self-reported time-activity data by subject ID and date time.
cSorting, loading, and transporting materials were combined into ‘Material movement and transport’ prior to testing agreement between the two sources of data with a kappa statistic.