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Table 1 Comparison of key characteristics for patients clinically diagnosed with or without sciatica. All figures are frequencies (percentages) unless stated otherwise as mean (SD)

From: Inflammatory biomarkers do not distinguish between patients with sciatica and referred leg pain within a primary care population: results from a nested study within the ATLAS cohort

Characteristics Clinically defined sciatica
n = 93
Referred pain
n = 26
MRI + ve
(n = 44)
MRI –ve
(n = 49)
 
Socio-demographics
 Age (years), mean (SD) 55.2 (11.7) 50.3 (14.7) 49.5 (11.1)
 Female gender, N (%) 24 (55) 32 (65) 17 (65)
 BMI, mean (SD) 30.8 (6.3) 29.5 (6.2) 32.5 (8.2)
 Current smoker, N (%) 17 (39) 14 (28) 9 (34)
Pain
 RMDQ disability score (0–23), mean (SD) 12.5 (5.1) 11.8 (6.0) 11.8 (6.8)
 Back pain intensity NRS, mean (SD) 6.6 (2.3) 6.7 (2.2) 6.9 (2.3)
 Leg pain intensity, NRS, mean (SD) 6.4 (2.4) 6.1 (2.4) 7.0 (2.4)
 Pain below knee, N (%) 30 (71) 28 (61) 21 (84)
 Leg pain is worse, N (%) 21 (49) 22 (45) 16 (61)
Duration of current symptomsa
Back pain
 Back pain< 6 weeks, N (%) 15 (36) 14 (29) 7 (27)
 Back pain 6–12 weeks, N (%) 12 (29) 8 (17) 7 (27)
 Back pain > 3 months, N (%) 15 (36) 26 (54) 12 (46)
Leg pain
 Leg pain< 6 weeks, N (%) 17 (40) 15 (33) 8 (32)
 Leg pain 6–12 weeks, N (%) 15 (36) 9 (20) 8 (32)
 Leg pain> 3 months, N (%) 10 (24) 22 (48) 9 (36)
  1. aThere was a small proportion of missing data for symptom duration