Table 5. Correlation between DLCO and exposure indicators.
| Spearman rank test | DLCO % | |
|---|---|---|
| Daily usage time | Correlation coefficient (rho) | −0.281 |
| P value | 0.019 | |
| n | 69 | |
| Cumulative usage time | rho | −0.329 |
| P value | 0.006 | |
| n | 67 | |
| Usage time during sleep | rho | −0.019 |
| P value | 0.880 | |
| n | 67 | |
| Distance to humidifier | rho | −0.101 |
| P value | 0.439 | |
| n | 61 | |
| Exposure concentration | rho | −0.101 |
| P value | 0.439 | |
| n | 61 | |
| Exposure intensity | rho | −0.280 |
| P value | 0.042 | |
| n | 53 | |
Bold font indicates statistical significance.
DLCO = diffusing capacity of the lung for carbon monoxide.