Table 13.

List of factors which have the highest sum of percentage score (a percentage from full score) of FACTOR (‘it is a factor for patient satisfaction’) and Not-FACTOR (‘it is a factor which does NOT relate to patient satisfaction’) based on the quality assessment for all type of the studies

	Factors (% score)
1st place	No mental health problems (739.8%)
2nd place	No/less post-operative pain (561.5%)
3rd place	Good physical function (536.9%)
4th place	Pre-operative expectations met (341.5%)
5th place	Severe pre-operative radiographic degenerative change (301.2%)
6th place	No low back pain (240.9%)

Percentage score of Not-FACTOR was calculated as negative value