Table 1. Distribution of workload demands in the tasks undertaken by the dock workers, according to the NASA Task Load Index (NASA-TLX). South region, Brazil, 2014.
| Workload demands | High Levels n (%) | Reduced levels n (%) | High levels of overall worload (n = 138) | Reduced levels of overall workload (n = 94) | P value* | SSE† |
|---|---|---|---|---|---|---|
| Average±sd | Average±sd | |||||
| Mental demand | 113 (48,7) | 119 (51,3) | 74,5±22,0 | 50,3±23,4 | <0,001 | 1,11 |
| Physical demand | 138 (59,5) | 94 (40,5) | 84,2±17,2 | 52,5±22,7 | <0,001 | 1,71 |
| Time demand | 86 (37,1) | 146 (62,9) | 69,7±24,9 | 38,8±23,3 | <0,001 | 1,28 |
| Performance | 173 (74,6) | 59 (25,4) | 89,7±14,9 | 67,7±25,4 | <0,001 | 1,13 |
| Total effort | 156 (67,2) | 76 (32,8) | 87,2±15,0 | 61,9±62,1 | <0,001 | 1,58 |
| Frustration | 77 (33,2) | 155 (66,8) | 56,6±32,1 | 36,8±27,9 | <0,001 | 0,60 |
* Student t Test; † Cohen SSE; sd: Standard deviation; SSE: Standardized Size effect