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Table 2 Patient characteristics of 581 patients included in cluster analysis a

From: OMERACT-based fibromyalgia symptom subgroups: an exploratory cluster analysis

Characteristics Mean (SD) orn(%) Median (range)
Age, yr 55.1 (12.4) 55.6 (20.1 to 90.2)
Race   
White 531 (91.4)  
Other 10 (1.7)  
Missing data 40 (6.9)  
Education   
Less than high school 13 (2.2)  
High school graduate or GED 122 (21.0)  
Some college or 2-year degree 225 (38.7)  
4-year college graduate 92 (15.8)  
Postgraduate studies 86 (14.8)  
Missing data 43 (7.4)  
Employment status   
Employed 206 (35.4)  
Retired 124 (21.3)  
Work-disabled 109 (18.8)  
Other (student, full-time homemaker, other) 69 (11.9)  
Unemployed 51 (8.8)  
Missing data 22 (3.8)  
Marital status   
Married/committed relationship 435 (74.9)  
Divorced/separated 55 (9.4)  
Single 44 (7.6)  
Widowed 25 (4.3)  
Missing data 22 (3.8)  
BMI, kg/m2 30.1 (7.6) 29.2 (12.6 to 59.2)
FM research survey   
WPI 12.6 (3.8) 13 (3 to 19)
SS 8.9 (2.0) 9 (5 to 12)
BPI   
Pain severity 5.1 (1.8) 5.3 (0.3 to 10)
Pain interference 5.7 (2.3) 5.9 (0 to 16.3)
MOS-Sleep Problems Index II 55.1 (18.9) 56.7 (8.9 to 97.8)
POMS   
Depression-Dejection 6.8 (5.1) 6 (0 to 20)
Tension-Anxiety 7.2 (4.8) 7 (0 to 20)
MFI-20   
General 17.3 (2.6) 18 (7 to 20)
Physical 15.8 (3.6) 17 (4 to 20)
Reduced activity 14.6 (3.9) 15 (4 to 20)
Reduced motivation 12.4 (3.8) 12 (4 to 20)
Mental 13.2 (4.2) 13 (4 to 20)
Total 73.3 (14.0) 74 (29 to 100)
MASQ 95.4 (22.0) 94 (49 to 162)
FIQ-R total 56.0 (18.7) 57.5 (5 to 96.2)
Stiffness 7.2 (2.2) 8 (0 to 10)
SF-36   
Physical 30.3 (8.6) 29.8 (8.3 to 52.9)
Mental 40.2 (12.6) 40.5 (7.5 to 66.8)
  1. aBMI, Body mass index; BPI, Brief Pain Inventory; FIQ-R, Revised Fibromyalgia Impact Questionnaire; FM, Fibromyalgia; GED, General educational development; MASQ, Multiple Ability Self-Report Questionnaire ; MFI, Multidimensional Fatigue Inventory; MOS-Sleep, Medical Outcomes Study Sleep Scale; POMS, Profile of Mood States; SF-36, Medical Outcomes Study 36-item Short Form survey; SS, Symptom severity; WPI, Widespread pain index.