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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Arthritis Care Res (Hoboken). 2016 Jul;68(7):965–973. doi: 10.1002/acr.22771

Table 1.

Description of Sample

Characteristic Level Total
Persons
Persons
with one
knee
Persons
with two
knees
Total
knees
Age, end of follow-
up period
<65 664 (35%) 417 (35%) 247 (35%) 911 (35%)
65+ 1251 (65%) 783 (65%) 468 (65%) 1719 (65%)

Sex Male 786 (41%) 546 (46%) 240 (34%) 1026 (39%)
Female 1129 (59%) 654 (55%) 475 (66%) 1604 (61%)

Race White 1412 (74%) 951 (79%) 461 (64%) 1873 (71%)
Non-White 502 (26%) 248 (21%) 254 (36%) 756 (29%)

Education High school
or less
364 (19%) 197 (17%) 167 (23%) 531 (20%)
Some college
or more
1538 (81%) 994 (83%) 544 (77%) 2082 (80%)

Baseline KL grade 2 970 (51%) -- -- 1488 (57%)
3 676 (35%) -- -- 871 (33%)
4 269 (14%) -- -- 271 (10%)
*

Note: one participant is missing information on sex. 13 participants are missing information on education.

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