Table 3.
Hospital RS Rates of IMV, Case-Fatality Rate, and LOS According to Quartiles of RS Initial NIV
| Characteristic | RS Initial NIV |
P Value (Kruskal-Wallis Test) |
P Value for Trend |
|||
|---|---|---|---|---|---|---|
| Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | |||
| RS-initial NIV,a % | 0.6 [0.5-0.7] | 1.5 [1.3-2.5] | 8.8 [7.8-9.1] | 18.1 [16.1-22.6] | NA | NA |
| RS- initial IMV,a % | 5.4 [4.9-7.5] | 5.7 [4.5-6.6] | 5.5 [5.0-6.6] | 5.7 [4.9-6.2] | .95 | .58 |
| RS-total IMV, % | 5.6 [5.0-7.5] | 5.9 [4.6-6.8] | 5.7 [5.2-6.7] | 5.9 [5.2-6.7] | .99 | .83 |
| RS-case fatality rate, % | 1.4 [1.2-1.5] | 1.3 [1.2-1.4] | 1.3 [1.2-1.5] | 1.2 [1.2-1.4] | .41 | .10 |
| RS-LOS, h | 102 [98-113] | 106 [95-113] | 91 [84-95] | 94 [78-112] | .02 | .01 |
Numbers in each row express the median and IQR. The Kruskal-Wallis test was used to compare all 4 quartiles. It tests if the 4 quartiles are the same (it ranks the values rather than computes a mean) versus the hypothesis that at least one is different. The P value test for trend assessed all 4 quartiles as well. LOS = length of stay; NA = not applicable. See Table 1 legend for expansion of other abbreviations.
a
Refers to the first method of ventilation during hospitalization.