Table 2.

Serum LDH levels at each time point after surgery in the two groups of patients ($\overline{x}\pm \text{s}$, U/L).

Group	n	1 day after surgery	7 d after surgery	1 month after surgery	6 month after surgery	12 month after surgery	3 years after surgery
Control group	47	409.75 ± 28.54	389.75 ± 27.46	333.86 ± 29.54	306.86 ± 24.75	292.75 ± 24.86	257.35 ± 21.54
Test group	54	397.46 ± 23.75	342.85 ± 23.75	299.75 ± 23.75	268.57 ± 23.75	257.86 ± 19.54	244.65 ± 19.43
t		−1.04	−4.86	−4.57	−4.68	−4.35	−2.89
P		0.12	<0.01	<0.01	<0.01	<0.01	0.03