Management of recurrent unilateral lumbar disc herniation in a single level: unilateral versus bilateral pedicle screws fixation with interbody fusion

Table 4 Comparison between unilateral group and bilateral group regarding intraoperative data and hospital length of stay

		Unilateral	Bilateral	Test value^a	P value	Sig.
Operation time (min)	Mean ± SD	122.44 ± 14.21	164.32 ± 14.22	− 10.524	0.000	HS
Operation time (min)	Range	115–160	120–190	− 10.524	0.000	HS
Blood loss (ml)	Mean ± SD	441.00 ± 116.57	740.00 ± 182.14	− 6.338	0.000	HS
Blood loss (ml)	Range	200–600	300–1100	− 6.338	0.000	HS
Hospital length of stay (days)	Mean ± SD	3.71 ± 0.88	4.52 ± 0.61	− 1.639	0.108	NS
Hospital length of stay (days)	Range	3–5	4–6	− 1.639	0.108	NS