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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