Table 1 Outcome of case–control matching procedure
Variables | Cases | Controls | ||
|---|---|---|---|---|
Number (n = 210) | Percent (%) | Number (n = 840) | Percent (%) | |
Gender | ||||
Male | 126 | 60.0 | 504 | 60.0 |
Female | 84 | 40.0 | 336 | 40.0 |
Age at recruitment (years) | ||||
30 - 40 | 3 | 1.4 | 14 | 1.7 |
41 - 50 | 22 | 10.5 | 102 | 12.1 |
51 - 60 | 83 | 39.5 | 327 | 38.9 |
Older than 60 | 102 | 48.6 | 397 | 47.3 |
Mean (standard deviation) | 60.7 (8.3) | 60.3 (8.6) | ||
Median (minimum: maximum) | 60.5 (36.5: 83.2) | 60.8 (32.7: 83.2) | ||
Date of admission (Sep 2012-Jul 2014) | ||||
1st year: recruitment | ||||
Sep 2012 - Nov 2012 | 22 | 10.5 | 85 | 10.1 |
Dec 2012 - Feb 2013 | 12 | 5.7 | 60 | 7.1 |
Mar 2013 - May 2013 | 25 | 11.9 | 73 | 8.7 |
Jun 2013 - Aug 2013 | 28 | 13.3 | 107 | 12.7 |
2nd year: recruitment | ||||
Sep 2013 - Nov 2013 | 28 | 13.3 | 70 | 8.3 |
Dec 2013 - Feb 2014 | 54 | 25.7 | 199 | 23.7 |
Mar 2014 - May 2014 | 21 | 10.0 | 139 | 16.6 |
Jun 2014 - Jul 2014 | 20 | 9.5 | 107 | 12.7 |