Table 3. Comparisons of clinical outcomes between the two groups.

	ALIF	OLIF	P—value
VAS back score
Preoperation	6.1± 2.7	6.2± 2.8	0.662
Postoperation	3.3± 2.3	3.3± 2.4	0.682
Final follow up	3.0± 2.5	3.1± 2.6	0.296
p value (pre-final)	<0.001	<0.001
VAS leg score
Preoperation	4.4± 3.5	3.5 ± 3.3	0.33
Postoperation	2.2± 2.4	1.2 ± 2.2	0.47
Final follow up	2.1 ± 2.6	2.2 ± 2.4	0.83
p value (pre-final)	<0.001	<0.001
ODI
Preoperation	44.4± 14.3	46.1± 15.5	0.74
Postoperation	49.5± 15.1	50.1± 18.3	0.4
Final follow up	31.2 ± 17.6	30.2 ± 16.2	0.478
p value (pre-final)	<0.001	<0.001
SRS-22, pain score
Preoperation	2.5 ± 0.6	2.3 ± 0.6	0.496
Postoperation	2.5 ± 0.6	2.5 ± 0.7	0.974
Final follow up	3.0 ± 0.8	3.2 ± 0.9	0.162
p value (pre-final)	<0.001	<0.001
SRS-22, self-image score
Preoperation	2.7 ± 0.6	2.8 ± 0.7	0.18
Postoperation	3.5 ± 0.5	3.5 ± 0.5	0.864
Final follow up	3.4 ± 0.8	3.6 ± 0.7	0.153
p value (pre-final)	<0.001	<0.001
SRS-22, mental health score
Preoperation	3.6 ± 0.7	3.6 ± 0.8	0.968
Postoperation	3.8 ± 0.6	3.6 ± 0.7	0.239
Final follow up	3.8 ± 0.8	3.8 ± 0.8	0.85
p value (pre-final)	<0.001	<0.001
SRS-22, satisfaction score
Preoperation	3.0 ± 0.9	2.9 ± 0.7	0.432
Postoperation	4.0 ± 0.6	4.0 ± 0.5	0.812
Final follow up	3.8± 0.9	4.1 ± 0.4	0.758
p value (pre-final)	<0.001	<0.001
SRS-22, function score
Preoperation	2.9 ± 0.6	2.7 ± 0.6	0.648
Postoperation	2.8 ± 0.4	3.2 ± 0.5	0.845
Final follow up	3.3 ± 0.7	3.5 ± 0.7	0.182
p value (pre-final)	<0.001	<0.001
SRS-22, total score
Preoperation	2.9 ± 0.5	2.7 ± 0.6	0.445
Postoperation	3.3 ± 0.4	3.4 ± 0.8	0.53
Final follow up	3.4 ± 0.5	3.6 ± 0.7	0.113
p value (pre-final)	<0.001	<0.001