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Table 1 Outcome of case–control matching procedure

From: Association between praziquantel treatment and cholangiocarcinoma: a hospital-based matched case–control study

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