Table 2. Workload Characteristics.
| Summary Statistics | Data |
|---|---|
| Infant acuity score | |
| Mean (SD) | 62.51 (56.51) |
| Median (IQR) | 49 (36-75) |
| NASA-TLX overall workload scorea | |
| Mean (SD) | 45.54 (19.21) |
| Median (IQR) | 45 (29-60) |
| Maximum ratio of infants to nurse, No. (%) of shifts | |
| 1:1 | 1022 (9.8) |
| 2:1 | 8730 (83.5) |
| 3:1 | 675 (6.4) |
| 4:1 | 25 (0.2) |
| Correlation coefficient (P value) | |
| Staffing ratio and acuity score | −0.32 (<.001) |
| Staffing ratio and NASA-TLX score | 0.19 (<.001) |
| Acuity score and NASA-TLX score | 0.19 (<.001) |
| Acuity score by maximum staffing ratio, mean/medianb | |
| 1 | 137.0/104 |
| 2 | 69.8/62 |
| ≥3 | 62.7/54 |
| NASA-TLX score by maximum staffing ratio, mean/median | |
| 1 | 38.3/38 |
| 2 | 44.5/44 |
| ≥3 | 60.0/65 |
Abbreviations: IQR, interquartile range; NASA-TLX, National Aeronautics and Space Administration Task Load Index.
a
Scores range from 4 (low) to 80 (high).
b
Scores range from 7 to 191, with higher scores indicating higher nursing care intensity.