Table 3.

Multivariate linear regression of covariates associated with radiographic outcomes at final assessment

	Total knee score (n=98)		Joint space width (n=98)
Covariate	Estimate	95% CI	Estimate	95% CI
Community controls	0.72	−1.64, 3.08	−0.15	−0.71, 0.41
Female	0.12	−2.59, 2.83	−0.38	−1.02, 0.25
Age at first radiograph	0.04	−0.16, 0.24	−0.04	−0.08, 0.01
Education level	0.13	−0.38, 0.65	−0.06	−0.18, 0.06
BMI at first radiograph	0.18	−0.22, 0.59	−0.10*	−0.19, −0.002
Outcome score at first radiograph	0.79*	0.17, 1.41	1.10***	0.63, 1.58
Prior knee injury	−0.47	−2.79, 1.85	0.03	−0.52, 0.57
Time from first radiograph (years)	0.36**	0.12, 0.59	−0.06*	−0.12, −0.01

Variables included in final model: group (controls versus runners), gender, age at initial radiograph, BMI at initial radiograph, total knee score at initial radiograph, history of knee injury prior to initial radiograph, and time interval (years) from initial to final radiograph

^*p<0.05

^**p<0.01

^***p<0.001