Table 2.

Group average (mean) for measures of Knee injury and Outcome Score (KOOS) scale (0–100) for pain, symptoms, function in daily living (ADL), sport and recreation (Sport_re), and quality of life (QOL)

KOOS subscales	Pain		Symptom		ADL		Sport_re		QOL
	mean	P-value*	mean	P-value*	mean	P-value*	mean	P-value*	mean	P-value*
Floor layers (n=134)	79.67	< 0.001	81.28	< 0.001	82.22	< 0.001	69.28	0.007	67.57	0.002
Graphic designers (n=120)	89.44		89.57		89.23		78.43		78.53
Tibio-femoral knee OA**
yes (n=216)	72.69	< 0.001	71.83	< 0.001	75.08	< 0.001	56.81	< 0.001	53.65	<0.001
no (n=37)	86.19		87.41		87.26		76.40		75.92
Patello-femoral knee OA**
yes (n=220)	78.82	0.009	80.69	0.009	79.32	0.001	62.34	0.007	62.50	0.013
no (n=33)	85.03		85.80		86.40		75.21		74.19
MRI-detected meniscal lesion in one or both knees#
yes (n=74)	82.64	0.220	83.83	0.280	84.35	0.029	72.36	0.073	69.01	0.039
no (n=50)	81.62		81.76		83.29		69.26		72.34

* Computed by multivariate analyses and adjusted for covariates (age, BMI, sports, and traumas).

** One missing.

# Missing 17: seven floor layers and nine graphic designers did not answer the KOOS questionnaire, and one did not respond on all the questions in the primary questionnaire.