Table 2.
Descriptive statistics and partial correlations between study variables
| Variables | Mean [pg/ml] | SD [pg/ml] | Range [pg/ml] | Lower detection limit [pg/ml] | Coefficient of variation (SD/mean × 100%) | Correlations with FeNO [ppb]^ |
|---|---|---|---|---|---|---|
| IFN-γ | 10.9 | 1.6 | 4.6 | 8.9 | 14.9 | 0.508 |
| IL-1a | 19.5 | 10.6 | 32 | 14.5 | 54.6 | 0.176 |
| IL-1ra | 125.6 | 39.4 | 128.1 | 67.4 | 31.3 | 0.155 |
| IL-2 | 41 | 7.4 | 22.9 | 19.9 | 18 | 0.777* |
| IL-5 | 28.9 | 8.9 | 26.7 | 22.0 | 30.6 | 0.032 |
| IL-6 | 16.4 | 4 | 12.1 | 9.6 | 24.3 | 0.631 |
| IL-7 | 24.3 | 2.9 | 8.4 | 16.9 | 12.1 | 0.054 |
| IL-8 | 3.9 | 0.8 | 2.3 | 2.9 | 21.3 | 0.583 |
| IL-12p70 | 4.6 | 0.9 | 2.9 | 3.0 | 20.1 | 0.231 |
| IL-13 | 11.8 | 3.1 | 8.6 | 7.5 | 26.5 | –0.478 |
| IL-15 | 65.4 | 12.3 | 35.6 | 24.1 | 18.9 | 0.485 |
| IL-16 | 33.7 | 4.3 | 14 | 24.4 | 12.7 | –0.084 |
| IL-17 | 135 | 53.9 | 165.8 | 115.0 | 39.9 | 0.118 |
| MCP-1 | 81.5 | 23.6 | 69.9 | 29.1 | 28.9 | 0.752* |
| MIG | 188.1 | 36.1 | 91.4 | 84.0 | 19.2 | 0.06 |
| MIP-1a | 40.8 | 18.3 | 48.8 | 16.5 | 44.8 | 0.582 |
| MIP-1b | 2.9 | 0.8 | 2.1 | 1.6 | 25.7 | 0.475 |
| PDGFBB | 6.8 | 3.3 | 9.5 | 6.3 | 47.8 | 0.942** |
| TIMP-2 | 302.1 | 150.7 | 410.7 | 212.9 | 49.9 | 0.734* |
| TNF-α | 34.4 | 3 | 9.5 | 13.5 | 8.6 | 0.176 |
^
All correlations between two different variables were controlled for the effects of age, FEV1 and number of asthma exacerbations. Data presented as a correlation coefficient.
*
Correlation is significant at the 0.05 level (2-tailed).
**
Correlation is significant at the 0.01 level (2-tailed).