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Table 1 Characteristics of OA cases and healthy controls

From: An intron polymorphism of the fibronectin gene is associated with end-stage knee osteoarthritis in a Han Chinese population: two independent case- control studies

Variables Study 1   Study 2   Study 1 + Study 2  
Case (%) Control (%) Case (%) Control (%) Case (%) Control (%) p
Number 403 314 525 379 928 693  
Age (mean ± SD) 72.54 ± 8.13 69.34 ± 9.80 72.18 ± 8.12 69.87 ± 9.96 72.34 ± 8.13 69.63 ± 9.88 < 0.001
Gender (% Female) 65.4% 53.8% 65.6% 58.6% 65.5% 56.4% < 0.001
BMI (mean ± SD) 25.28 ± 3.13 24.95 ± 9.88 25.08 ± 3.16 24.26 ± 3.79 25.17 ± 3.15 24.57 ± 7.22 0.04
K-L grading (%)        
Grade 0 0 162 (51.60) 0 189 (49.87) 0 351 (50.65)  
Grade 1 0 152 (48.40) 0 190 (50.13) 0 342 (49.35)  
Grade 2 146 (36.23) 0 205 (39.05) 0 351 (37.82) 0  
Grade 3 73 (18.11) 0 74 (14.10) 0 147 (15.84) 0  
Grade 4 184 (45.66) 0 246 (46.85) 0 430 (46.34) 0