From: 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?
Baseline data and outcomes
Responders (postal)
Non-responders (telephone)
PGIC improved (1 and 2)
33 %
49 %
PGIC worse (5, 6 and 7)
15 %
4 % p = 0.02
Slightly worse (5)
8 %
4 %
Worse (6)
5 %
0 %
Much worse (7)
2 %