Table 2.

LnCRP by radiographic osteoarthritis affection status.

Group	N	Mean hsCRP (mg/L)	Mean Ln hsCRP	95% Confidence Intervals
Presence of knee rOA
KL knee 0/KL hip 0	276	1.60	7.38	7.22 – 7.54
KL knee 2–4	386	2.56	7.85**	7.72 – 7.99
Knee rOA severity
KL knee 0/KL hip 0	276	1.60	7.38	7.22 – 7.54
KL knee2	264	2.16	7.68*	7.52 – 7.84
KL knee 3	88	3.32	8.11**	7.82 – 8.39
KL knee 4	34	4.92	8.50**	8.05 – 8.96
Laterality of knee rOA
KL knee 0/KL hip 0	276	1.60	7.38	7.22 – 7.54
Unilateral KL knee 2–4	192	2.07	7.64*	7.45 – 7.83
Bilateral KL knee 2–4	194	3.16	8.06**	7.87 – 8.25
Co-occurrence of knee & hip rOA
KL knee 0/KL hip 0	276	1.60	7.38	7.22 – 7.54
KL knee 2–4/KL hip 0	218	2.27	7.73*	7.55 – 7.91
KL knee 2–4/hip 2–4	122	2.60	7.87*	7.62 – 8.11
Numbers of knees and hips with rOA
0 joints affected	276	1.60	7.38	7.22 – 7.54
1 joint affected	115	1.75	7.47	7.22 – 7.72
2 joints affected	132	2.78	7.93**	7.70 – 8.16
3 joints affected	51	2.48	7.82*	7.45 – 8.19
4 joints affected	42	3.29	8.10*	7.69 – 8.51

Ln hsCRP = natural logarithm of high-sensitivity C-reactive protein in serum (for presentation purposes, hsCRP was expressed in μg/L prior to natural log transformation)

^*p < 0.05 compared to control;

^**p < 0.0001 compared to control Radiographic osteoarthritis (rOA) = Kellgren-Lawrence (K-L) grades 2–4