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Table 1 Baseline variables and major outcomes of patients in the study and across clusters

From: Clustering patients on the basis of their individual course of low back pain over a six month period

  Patients
in the study
n = 165
Patients
excluded
n = 68
Cluster 1,
n = 43
Cluster 2,
n = 23
Cluster 3,
n = 72
Cluster 4,
n = 27
Age, mean,
(range) *
45
(21-69)
42
(16-64)
42
(21-62)
46
(33-63)
45
(24-69)
49
(27-67)
Gender, % male 54 50 56 46 49 70
Pain, VAS mean,
(SD)*
4.4
(2.1)
4.4
(2.4)
3.7
(2.6)
5.3
(1.9)
4.6
(1.9)
4.2
(2.1)
Leg pain, % 48 48 35 47 53 57
> 30 days of pain previous year, % * 58 61 56 30 64 70
EQ5D baseline, mean
(range)
0.73
(-0.05-1.00)
0.78
(0.70-0.84)
0.79
(-0.05-1.00)
0.69
(0.26-0.84)
0.72
(-0.05-1.00)
0.70
(-0.05-0.84)
Improvement by 4th visit, % 73 58 80 73 68 74
Total number of days with bothersome pain, mean
(SD) *
38
(35)
35
(32)
33
(37)
28
(20)
35
(31)
64
(39)
  1. * Denotes statistically significant differences between clusters.