Table 2.

Evaluation of potential risk factors for medial meniscal pathology on magnetic resonance imaging over 30 months in knees (n=791) of middle-aged and elderly persons.

Risk factor	Crude* OR	Adjusted† OR (95% CI)	Fully Adjusted§ OR (95% CI)
Age, years
50 to 55	ref	ref	ref
56 to 63	0.95	0.96 (0.53, 1.72)	1.03 (0.55, 1.91)
64 to 79	1.03	1.12 (0.62, 2.02)	1.08 (0.57, 2.05)
Gender
male	ref	ref	ref
female	0.71	0.70 (0.43, 1.15)	0.80 (0.46, 1.40)
Body mass index, kg/m2
<25	ref	ref	ref
25 to 29	0.99	0.94 (0.43, 2.02)	0.96 (0.44, 2.09)
30 or above	1.69	1.62 (0.79, 3.33)	1.52 (0.73, 3.16)
Bony enlargements of finger joints‡, n
0 to 4	ref	ref	ref
5 or more	1.61	1.66 (1.03, 2.68)	1.64 (1.00, 2.70)
Knee injury during follow-up**
no	ref	ref	ref
yes	4.84	4.67 (2.31, 9.42)	4.14 (2.06, 8.31)
Knee alignment
not varus (≥179°)	ref	ref	ref
varus (<179°)	2.20	2.09 (1.24, 3.51)	2.00 (1.18, 3.40)
Leg-length inequality
less than 1 cm	ref	ref	ref
1 cm or more	0.84	0.80 (0.40, 1.61)	0. 90 (0.45, 1.80)

OR= odds ratio, 95% CI=95% confidence interval, ref = reference category

^*Adjusted for race and clinical site only (generalised estimating equations).

^†Adjusted for race, clinical site, age, sex, and body mass index only (generalised estimating equations).

^§The primary model, adjusted for all covariates in the table and race and clinical site (generalised estimating equations).

^‡Test for trend using continuous predictor variable, P=0.28.

^**Knee injury leading to limited ability to walk for 2 days or more.