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?

However, when analysing the two groups separately, this was only statistically significantly different in the telephone interview patients (p = 0.012) (Table 3 ), whereas it did not reach statistical significance in the responders (postal questionnaire) group (Table 4 ).

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The telephone interview patients (non-responders) who had more than one level injected still had higher NRS scores at 20-30 min compared to those patients having only one level injected (p = 0.053), but this did not quite reach statistical significance.

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