Imaging-guided lumbar facet injections: is there a difference in outcomes between low back pain patients who remember to return a postal questionnaire and those who do not?

Insights into Imaging

Table 8 NRS score results of age- and gender-matched patients with one level injected compared to those having more than one spinal level injected within the group of responders (postal questionnaire)

Baseline data and outcomes	1 level injected, mean + (SD)	2 or more levels injected, mean + (SD)	1 vs. > 2 levels (p)
Pre NRS (baseline)	6.5 (2.1)	7.2 (2.1)	0.144
20-30-min NRS	3.7 (2.6)*	3.8 (2.6)*	0.991
1-month NRS	4.4 (2.5)*	3.9 (2.7)*	0.371