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. 2011 Sep 12;6:61. doi: 10.1186/1750-1172-6-61

Table 3.

Patient Characteristics After Matching

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)

* "Reference" indicates group used for odds ratios comparison.