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Table 4

Original study baseline characteristics of study participants

Full 7-year follow-up (group 1: n=112)Limited 7-year follow-up (group 2: n=43)Groups 1 and 2: (n=155)No 7-year follow-up data available (group 3: n=187)p Value: groups 1 and 2 vs 3
Gender (female)*72 (64%)28 (65%)100 (65%)100 (53%)0.04
Age (years)46.9 (8.3)47.0 (7.7)47.0 (8.1)47.4 (8.2)0.63
Pain intensity4.4 (2.7)4.5 (2.9)4.4 (2.8)4.7 (2.5)0.26
Disability9.1 (6.8)10.7 (6.8)9.5 (6.8)10·6 (6.4)0.14
CPG IV*30 (28%)17 (40%)47 (31%)57 (32%)0.86
Anxiety8.2 (4.8)9.1 (4.6)8.5 (4.8)8.6 (4.9)0.82
Depression6.1 (4.4)8.4 (4.9)6.8 (4.6)7.5 (4.8)0.15
Duration of pain*
 ≤6 months42 (38%)14 (33%)56 (36%)51 (28%)0.10
 7–35 months23 (21%)14 (33%)37 (24%)48 (26%) 
 ≥3 years46 (41%)15 (35%)61 (40%)85 (46%) 
Cluster*
 Recovering42 (38%)15 (35%)57 (37%)47 (25%)0.10
 Persistent mild34 (30%)17 (40%)51 (33%)71 (38%) 
 Fluctuating13 (12%)3 (7%)16 (10%)29 (16%) 
 Severe-chronic23 (21%)8 (19%)31 (20%)40 (21%) 

Figures are mean (SD) except those marked.

*Which are numbers (percentage).

CPG IV, Chronic Pain Grade IV.

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