| 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | p-value | |
| Alive | |||||||||||
| CTPA# | 2535 (34.38) | 3554 (43.41) | 4103 (48.5) | 4706 (54.24) | 5351 (56.68) | 6305 (61.01) | 7273 (64.12) | 8020 (66.08) | 9276 (66.83) | 9318 (66.52) | <0.001 |
| Lung scintigraphy# | 3428 (46.49) | 3329 (40.66) | 2849 (33.68) | 2304 (26.55) | 1913 (20.26) | 1680 (16.26) | 1468 (12.94) | 1365 (11.25) | 1238 (8.92) | 1130 (8.07) | <0.001 |
| Dead | |||||||||||
| CTPA# | 180 (16.44) | 239 (20) | 284 (25.79) | 307 (26.17) | 323 (28.43) | 382 (34.35) | 466 (38.48) | 493 (40.64) | 492 (37.08) | 530 (41.7) | <0.001 |
| Lung scintigraphy# | 208 (19) | 152 (12.72) | 150 (13.62) | 149 (12.7) | 116 (10.21) | 85 (7.64) | 67 (5.53) | 59 (4.86) | 60 (4.52) | 58 (4.56) | <0.001 |
Data are presented as n (%), unless otherwise stated. CTPA: computed tomographic pulmonary angiography. #: significant trend from 2002 to 2011.