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Figure 1 Anti-factor Xa (anti-Xa) levels during the first 24 h of treatment with subcutaneous (SQ) alone (solid circles) or intravenous +SQ (open squares) enoxaparin. Data are presented as the mean value ± SEM. Dotted lines represent the lower and upper therapeutic range (0.5 and 1.0 U/ml, respectively). Significant differences (p < 0.05) using the t test between the two groups are marked with an asterisk.