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Table 2 Associations between high (SSS-8 ≥ 12) or very high somatising tendency (SSS-8 ≥ 16) and disability due to knee pain from multiple logistic regression models (n = 14,695)

From: Disability due to knee pain and somatising tendency in Japanese adults

  SSS8 ≥ 12 SSS8 ≥ 16
OR [95% CI]a p-value Type 3 p-value OR [95% CI]a p-value Type 3 p-value
Disability due to pain    < 0.001    < 0.001
 Knee pain without difficulty in ADL 1    1   
 Knee pain with difficulty but without sick leave 2.36 [2.10, 2.66] < 0.001   2.80 [2.42, 3.23] < 0.001  
 Knee pain with sick leave 3.23 [2.66, 3.92] < 0.001   4.51 [3.64, 5.58] < 0.001  
Chronic knee pain yes vs. no 1.28 [1.16, 1.41] < 0.001   1.12 [0.98, 1.28] 0.103  
  1. SSS-8 Somatic Symptom Scale-8, OR odds ratio, CI confidence interval, ADL activities of daily living
  2. aAdjusted for age, sex, body mass index, depressive symptoms (Patient Health Questionnaire-2 (PHQ-2)), education, regular exercise, osteoarthritis, rheumatoid arthritis, and fibromyalgia