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Table 2 Levels of metal ions over time by sex, side, and body mass index

From: Intermediate-term trends in serum levels of metal ions after hip resurfacing arthroplasty

Time point Cr p Co p Mo p
Preoperation       
 Men 0.70 (0.03) 0.949 0.72 (0.04) 0.949 0.82 (0.02) 0.564
 Women 0.70 (0.03)   0.74 (0.03)   0.83 (0.02)  
 Unilateral 0.68 (0.03) 0.478 0.72 (0.04) 0.848 0.82 (0.02) 0.564
 Bilateral 0.72 (0.02)   0.74 (0.03)   0.83 (0.02)  
 BMI <25 kg/m2 0.73 (0.02) 0.037 0.71 (0.02) 0.196 0.83 (0.01) 0.518
 BMI ≥25 kg/m2 0.66 (0.02)   0.76 (0.04)   0.81 (0.02)  
3 months       
 Men 1.06 (0.16) 0.668 1.55 (0.56) 0.116 6.26 (1.41) 0.253
 Women 1.30 (0.29)   2.01 (0.57)   7.23 (0.88)  
 Unilateral 1.15 (0.21) 0.237 1.97 (0.50) 0.866 6.16 (0.78) 0.176
 Bilateral 1.31 (0.22)   1.21 (0.15)   8.86 (2.01)  
 BMI <25 kg/m2 1.16 (0.22) 0.253 2.97 (1.05) 0.288 4.68 (0.56) 0.235
 BMI ≥25 kg/m2 1.20 (0.22)   1.44 (0.36)   7.41 (0.92)  
12 months       
 Men 1.80 (0.52) 0.487 2.16 (0.59) 0.298 6.91 (1.06) 0.817
 Women 1.81 (0.4)   3.19 (0.72)   7.10 (0.78)  
 Unilateral 1.67 (0.37) 0.713 2.32 (0.55) 0.327 7.35 (0.66) 0.540
 Bilateral 2.06 (0.62)   3.50 (0.88)   6.33 (1.39)  
 BMI <25 kg/m2 3.03 (1.47) 0.243 3.41 (1.86) 0.322 6.86 (3.65) 0.493
 BM I ≥25 kg/m2 1.61 (0.28)   2.60 (0.50)   7.03 (0.6)  
24 months       
 Men 1.20 (0.39) 0.04 2.96 (0.78) 0.661 4.67 (0.42) 0.242
 Women 1.88 (0.30)   3.09 (0.59)   5.55 (0.86)  
 Unilateral 1.53 (0.27) 0.236 3.00 (0.46) 0.693 4.84 (0.48) 0.324
 Bilateral 2.08 (0.75)   3.26 (2.04)   7.23 (2.56)  
 BMI <25 kg/m2 1.85 (0.45) 0.938 3.40 (0.74) 0.721 4.35 (0.74) 0.276
 BMI ≥25 kg/m2 1.47 (0.3)   2.81 (0.60)   5.75 (0.74)  
60 months       
 Men 1.17 (0.11) 0.584 3.60 (0.62) 0.361 7.42 (0.57) 0.584
 Women 1.24 (0.28)   2.52 (0.720   7.60 (1.32)  
 Unilateral 1.33 (0.28) 0.855 2.54 (0.70) 0.465 7.04 (1.25) 0.361
 Bilateral 1.06 (0.06)   3.63 (0.66)   8.09 (0.67)  
 BMI <25 kg/m2 1.29 (0.24) 1.000 2.80 (0.63) 0.850 7.12 (1.1) 0.345
 BMI ≥25 kg/m2 1.06 (0.08)   3.45 (0.87)   8.22 (0.65)  
  1. Data shown as mean (standard error)