|  | Category* |  |  |  |  |  |
---|---|---|---|---|---|---|---|
 |  | Non-obstructed | Discordant | Obstructed | p-value†| ||
 |  | (LLN-Fixed-) | (LLN-Fixed+) | (LLN+Fixed+) | Overall difference between categories | LLN-Fixed+ versus LLN-Fixed- | LLN-Fixed+ versus LLN+Fixed+ |
Swanney [6], 2008 | FEV1 decline | -15 (1) | -17 (4) | -36 (4) | < 0.001 | 0.624 | < 0.001 |
 | n | 1,828 | 251 | 237 |  |  |  |
ECSC [25], 1993 | FEV1 decline | -15 (1) | -15 (8) | -28 (3) | < 0.001 | 0.975 | 0.132 |
 | n | 1,831 | 71 | 426 |  |  |  |
Kuster [28], 2008 | FEV1 decline | -15 (1) | -8 (12) | -26 (3) | < 0.001 | 0.076 | 0.009 |
 | n | 1,814 | 28 | 532 |  |  |  |
Falaschetti [26], 2004 | FEV1 decline | -15 (1) | -22 (8) | -27 (3) | < 0.001 | 0.376 | 0.521 |
 | n | 1,785 | 71 | 488 |  |  |  |
Brandli [27], 2000 | FEV1 decline | -15 (1) | -17 (6) | -31 (3) | < 0.001 | 0.746 | 0.036 |
 | n | 1,828 | 125 | 349 |  |  |  |
Hankinson [29], 1999 | FEV1 decline | -15 (1) | -7 (10) | -26 (3) | < 0.001 | 0.424 | 0.061 |
 | n | 1,816 | 46 | 482 |  |  |  |