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Table 3 Patient Characteristics After Matching

From: Reducing selection bias in case-control studies from rare disease registries

  Patients with Avascular Necrosis Patients without Avascular Necrosis Odds Ratio 95% Confidence Interval
After Matching 672 2390   
Gender, n (%)     
Male 323 (48·1) 1139 (47·7) Reference*  
Female 349 (51·9) 1251 (52·3) 0·99 (0·85,1·15)
Year of Birth, n (%)     
1910 - < 1920 3 (0·4) 17 (0·7) 0·66 (0·21,2·07)
1920 - < 1930 17 (2·5) 78 (3·3) 0·79 (0·47,1·31)
1930 - < 1940 64 (9·5) 163 (6·8) 1·24 (0·91,1·68)
1940 - < 1950 88 (13·1) 299 (12·5) 1·00 (0·76,1·32)
1950 - < 1960 114 (17·0) 387 (16·2) Reference*  
1960 - < 1970 89 (13·2) 379 (15·9) 0·84 (0·63,1·10)
1970 - < 1980 124 (18·5) 404 (16·9) 1·03 (0·80,1·33)
1980 - < 1990 115 (17·1) 354 (14·8) 1·08 (0·83,1·40)
1990 - < 2000 55 (8·2) 276 (11·5) 0·73 (0·53,1·01)
2000 - < 2010 3 (0·4) 33 (1·4) 0·37 (0·12,1·15)
Treatment Status, n (%)     
Untreated 322 (47·9) 1197 (50·1) Reference*  
Treated 350 (52·1) 1193 (49·9) 1·07 (0·92,1·24)
Splenectomy Status, n (%)     
Spleen intact 447 (66·5) 1752 (73·3) Reference*  
Splenectomized 225 (33·5) 638 (26·7) 1·28 (1·09,1·51)
  1. * "Reference" indicates group used for odds ratios comparison.