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Table 3: Blood gas data before and after cement injection
Before Injection N 10 Min N 30 Min N 60 Min N
pH 
    PMMA 7.41 ± 0.03 5 7.40 ± 0.08 5 7.41 ± 0.08 5 7.41 ± 0.08 5
7.36–7.45 7.29–7.50 7.31–7.51 7.31–7.51 
    PMMA & HA 7.47 ± 0.09 5 7.38 ± 0.11 6 7.40 ± 0.10 6 7.41 ± 0.10 6
7.35–7.58 7.27–7.49 7.30–7.51 7.31–7.51 
Pco₂ (mm Hg) 
    PMMA 42.9 ± 6.3 5 44.8 ± 5.9 5 43.6 ± 6.5 5 43.0 ± 6.5 5
35.0–50.8 37.5–52.2 35.5–51.7 34.9–51.1 
    PMMA & HA 35.7 ± 7.4 5 48.0 ± 12.7 6 46.0 ± 12.7 6 44.5 ± 10.5 6
26.4–44.9 34.6–61.3 32.6–59.3 33.5–55.5 
Po₂ (mm Hg) 
    PMMA 509 ± 60 5 361 ± 175 5 453 ± 75 5 461 ± 66 5
435–583 144–579 360–547 378–543 
    PMMA & HA 504 ± 33 5 328 ± 163 6 342 ± 145 6 377 ± 121 6
462–545 158–499 190–494 251–504 
Note:—PMMA indicates polymethylmethacrylate; HA, hydroxyapatite; Po₂, partial pressure of oxygen; Pco₂, partial pressure of carbon dioxide. The values are given as mean ± SD and as 95% confidence intervals on the line below.