Table 3 Patient Characteristics After Matching
From: Reducing selection bias in case-control studies from rare disease registries
| Â | Patients with Avascular Necrosis | Patients without Avascular Necrosis | Odds Ratio | 95% Confidence Interval |
|---|---|---|---|---|
After Matching | 672 | 2390 | Â | Â |
Gender, n (%) | Â | Â | Â | Â |
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 (%) | Â | Â | Â | Â |
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 (%) | Â | Â | Â | Â |
Untreated | 322 (47·9) | 1197 (50·1) | Reference* |  |
Treated | 350 (52·1) | 1193 (49·9) | 1·07 | (0·92,1·24) |
Splenectomy Status, n (%) | Â | Â | Â | Â |
Spleen intact | 447 (66·5) | 1752 (73·3) | Reference* |  |
Splenectomized | 225 (33·5) | 638 (26·7) | 1·28 | (1·09,1·51) |