Table 2.

The concentrations of serum lipids in two groups (mmol/L)

Serum lipids	Disc herniation	Control group	t value	P value
	(n = 396)	(n = 394)
TC	4.75 ± 1.02	4.41 ± 0.90	4.984	<0.001
TG	1.46 ± 0.89	1.35 ± 0.94	1.669	0.096
LDL-C	2.92 ± 0.86	2.62 ± 0.73	5.129	<0.001
HDL-C	1.32 ± 0.30	1.34 ± 0.47	0.641	0.521

Data are given as the means ± SD, and analysed with independent-sample t-tests