Table 5.

Multivariate analysis of the correlation between research factors and IKDC classification

Variable	B	S.E.	Wald	p	OR	95% CI
						Lower	Upper
Sex
Male	0.532	0.234	5.151	0.023*	1.702	1.076	2.697
Female‡	–	–	–	–	1.000	–	–
BMI (kg/m2)
< 18.5	1.104	0.497	4.926	0.026*	3.016	1.138	7.996
18.5 ~ 25	0.531	0.285	3.467	0.063	1.701	0.972	2.974
≥ 25‡	–	–	–	–	1.000	–	–
Work intensity
Grade 0 ~ 1	0.331	0.506	0.427	0.514	1.392	0.516	3.751
Grade 2	−0.223	0.481	0.214	0.644	0.800	0.312	2.056
Grade 3 ~ 4‡	–	–	–	–	1.000	–	–
History of trauma
No	−0.179	0.232	0.597	0.440	0.836	0.531	1.317
Yes‡	–	–	–	–	1.000	–	–
Age of onset (year)
≤ 14	3.034	0.498	37.069	0.000*	20.780	7.822	55.147
14 ~ 25	2.142	0.418	26.293	0.000*	8.516	3.755	19.317
25 ~ 45	0.545	0.33	2.732	0.098	1.725	0.904	3.294
≥ 45‡	–	–	–	–	1.000	–	–
Symptoms duration (month)
≤ 1	1.256	0.37	11.501	0.001*	3.511	1.699	7.265
1 ~ 6	1.242	0.303	16.826	0.000*	3.463	1.914	6.265
6 ~ 24	1.180	0.287	16.949	0.000*	3.254	1.855	5.703
>24‡	–	–	–	–	1.000	–	–
Medial meniscus tear
No	0.089	0.624	0.021	0.886	1.093	0.322	3.717
Yes‡	–	–	–	–	1.000	–	–
Outerbridge grade
No injury	1.853	0.469	15.629	0.000*	6.379	2.545	15.975
Grade I	1.466	0.572	6.569	0.010*	4.332	1.412	13.277
Grade II	0.758	0.488	2.418	0.120	2.134	0.820	5.551
Grade III ~ IV‡	–	–	–	–	1.000	–	–
K-L grade
Grade 0	0.184	0.690	0.071	0.790	1.202	0.311	4.646
Grade I	−0.112	0.685	0.027	0.870	0.894	0.233	3.425
Grade II	−0.563	0.707	0.634	0.426	0.569	0.142	2.277
Grade III ~ IV‡	–	–	–	–	1.000	–	–
Type of surgery
Saucerization	0.546	0.387	1.983	0.159	1.726	0.807	3.688
Saucerization with repair	−0.262	0.678	0.149	0.699	0.770	0.204	2.907
Total meniscectomy‡	–	–	–	–	1.000	–	–

IKDC International Knee Documentation Committee, BMI body mass index, K-L grade Kellgren–Lawrence grade

‡ represent reference group; *Statistically significant (P < .05)