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Table 1 Demographic characteristics of study patients, overall and by the main subgroups with (NP) and without (NNP) associated neuropathic component.

From: Validity and reliability of the Spanish version of the DN4 (Douleur Neuropathique 4 questions) questionnaire for differential diagnosis of pain syndromes associated to a neuropathic or somatic component

Variable Total NP NNP
N 158 99 (62.7%) 59 (37.3%)
Sex, females; n (%) 93 (58.9%) 46 (47%) 47 (80%)
Race (Caucasian); n (%) 149 (95.5%) 93 (94%) 56 (98%)
Age (years) 60.1 (15.9) 57.2 (15.2) 64.9 (16.1)
BMI (kg/m2) 27.3 (4.6) 27.3 (4.1) 27.2 (5.4)
Drug therapy;    
n (%): 145 (91.8%) 89 (90%) 56 (95%)
no. of drugs: a 2.0 (1.0 – 3.0) 2.0 (1.0 – 3.0) 2.0 (1.0 – 3.0)
Educational level; n (%)    
No studies: 39 (25.0%) 19 (19%) 20 (35%)
Primary school: 69 (44.2%) 45 (46%) 24 (41%)
High school: 14 (9.0%) 12 (12%) 2 (3%)
Vocational training: 16 (10.3%) 14 (14%) 2 (3%)
Graduate studies: 18 (11.5%) 8 (8%) 10 (17%)
SF-MPQ scoring;    
Sensory dimension (0 – 33): 12.4 (6.4) 13.1 (6.0) 11.3 (6.8)
Affective dimension (0 – 12): 4.9 (3.6) 4.8 (3.6) 5.2 (3.6)
Total score (0 – 45): 17.4 (8.3) 17.9 (8.1) 16.5 (8.8)
Pain in the previous week (VAS; 0 – 100): 65.4 (20.7) 65.6 (22.2) 65.0 (18.2)
  1. Values are given as mean (standard deviation) or frequency (%) based on the number of valuable cases (information available). BMI = Body Mass Index, SF-MPQ = Short Form McGill Pain Questionnaire. aMedian (1st – 3rd quartile), p < 0.05 vs. NNP group.