Disabling knee pain – another consequence of obesity: Results from a prospective cohort study

BMC Public Health

Table 3 Onset of severe knee pain at three years in people aged 50 and over with no knee pain at baseline by body mass index (BMI) category.

BMI category at baseline		Severe knee pain at 3 years	Unadjusted analysis			Adjusted analysis^a
	n	n (%)	Relative Risk (RR) (95% Confidence Interval (CI))	RR^b (95% CI)	Potential cases avoided^c (% of all incident cases)	RR (95% CI)	RR^b (95% CI)	Potential cases avoided^c (% of all incident cases)
Normal^d	939	50 (5.3)	1.00	-	-	1.00	-	-
Overweight	785	56 (7.1)	1.34 (0.93, 1.94)	1.00	14 (10.1)	1.53 (1.03, 2.26)	1.00	20 (14.4)
Obese	223	33 (14.8)	2.78 (1.84, 4.21)	2.07 (1.39, 3.11)	17 (12.2)	2.79 (1.75, 4.47)	1.85 (1.17, 2.92)	15 (10.8)
Total	1947^e	139 (7.1)			31 (22.3)			35 (25.2)

^a adjusted for age, gender, deprivation, anxiety, depression, previous knee injury, widespread pain measured at baseline
^b obesity category compared to overweight
^c number of cases which could have been avoided by reducing overweight people to normal and obese people to overweight
^d Normal weight category includes individuals who were underweight
^e Total number is smaller than in Table 2, because 49 people had incomplete WOMAC data and severity scores could not be calculated.

ISSN: 1471-2458