Table 2.

OKS scores for different BMI groups

BMI	OKS pre-surgery		OKS at 12 months		OKS improvement
	Median	25th/75th percentile	Median	25th/75th percentile	Median	25th/75th percentile
< 25	21.0	17.0/27.0	39.0	26.0/44.0	15.0	7.0/21.0
25–30	22.0	17.0/28.5	41.0	28.0/45.0	15.0	8.5/21.5
30–35	19.0	15.0/25.5	36.0	27.0/41.5	14.0	8.0/21.5
35–40	19.0	15.0/24.0	34.0	25.5/41.5	14.0	5.0/20.0
≥ 40	15.5	10.3/19.8	27.5	22.0/38.5	14.0	5.3/20.0
p value	< 0.001		< 0.001		n.s