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Table 2

Relationship between QTF categories and global perceived effect (GPE)

QTF categories2 weeks, proportion improved
% (95% CI)
3 months, proportion improved
% (95% CI)
12 months, proportion improved
% (95% CI)
Chiropractic patients
P < 0.01*
General practice patients
P < 0.01*
Chiropractic patients
P = 0.2*
General practice patients
P = 0.2*
Chiropractic patients
P = 0.4*
General practice patients
P = 0.5*
All patients74 (70–77)36 (31–42)82 (79–85)60 (54–66)73 (23–30)54 (48–60)
‘LBP alone’77 (73–81)49 (38–60)82 (78–85)69 (58–78)74 (69–78)53 (42–65)
‘LBP + leg pain above the knee’72 (64–79)43 (28–60)85 (79–90)66 (49–80)75 (67–81)66 (48–80)
‘LBP + leg pain below the knee’61 (46–74)19 (9–38)73 (59–83)46 (29–65)63 (49–76)54 (34–72)
‘LBP + NRI’40 (17–68)20 (7–45)87 (55–97)56 (31–78)73 (43–91)44 (20–70)

Proportions improved after 2 weeks, 3 months and 12 months

LBP low back pain, NRI nerve root involvement

*P-value for an overall association between QTF categories and GPE

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