Table 1. Demographics and lung function (baseline and change from time of initial diagnosis with Western red cedar asthma).
N | Mean | SD | Range | |
Age (years) | 40 | 62.0 | 10.0 | 33, 82 |
Years from initial diagnosis | 40 | 24.5 | 6.8 | 6, 38 |
Years from last exposure | 40 | 17.0 | 9.3 | 1, 34 |
FEV1, percent predicted | 40 | 83.2 | 16.1 | 48, 128 |
PC20-FEV1 (methacholine, mg/ml) | 40 | 6.8 | 6.8 | 0.1,16.0 |
Change of PC20 (mg/ml) | 30* | 2.0 | 8.7 | −24.1,15.0 |
Change of FEV1 (L) | 40 | −1.5 | 0.6 | −2.6, −0.4 |
Change of FEV1 per year (L) | 40 | −0.07 | 0.05 | −0.3, −0.01 |
10 subjects did not have PC20 available from the time of initial diagnosis with Western red cedar asthma