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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Psychosom Med. 2017 Jan;79(1):24–33. doi: 10.1097/PSY.0000000000000363

Table 2.

Clinical characteristics of the rheumatoid arthritis and control groups.

Rheumatoid arthritis (n = 24) Controls (n = 48) p
PSQI global score 7.1 ± 3.9 3.3 ± 2.5 <0.001
Epworth sleepiness scale 6.7 ± 3.0 5.0 ± 3.4 0.088
Beck depression inventory 5.6 ± 4.5 2.4 ± 4.0 0.004
FSI interference score 18.9 ± 20.4 5.3 ± 8.0 .007
SF-36
 PCS 39.5 ± 11.1 53.5 ± 7.4 <0.001
 MCS 52.0 ± 8.8 55.4 ± 10.0 0.18
sf-MPQ
 Bedtime prior to PSG
  Present pain intensity 1.0 ± 0.7 0.1 ± 0.3 <0.001
  Pain descriptor score 3.7 ± 5.6 0.4 ± 1.3 0.010
 Morning following PSG
  Present pain intensity 1.0 ± 0.8 0.2 ± 0.4 <0.001
  Pain descriptor score 2.8 ± 2.8 0.4 ± 1.3 0.001

Results are presented as means ± SD.

Abbreviations: FSI = fatigue symptom inventory, MCS = mental component summary, PCS = physical component summary, PSG = polysomnography, PSQI = Pittsburgh sleep quality index, SF-36 = short form (36) health survey, sf-MPQ = short form McGill pain questionnaire.