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Table 1 Baseline description of the two clinical study samples of patients with low back pain (LBP)

From: Absence of low back pain in patients followed weekly over one year with automated text messages

Population Study 1 Study 2
  LBP with Modic changes Non-specific LBP
Number of participants 100 241
Age mean 46 38
Age range 21-61 18-60
Proportion women 68% 54%
Mean LBP according to Low Back Pain Rating Scale (0-30) 18 18
Mean LBP according to Numeric Rating Scale (0-10) 5.3 4.9
Mean leg pain according to Low Back Pain Rating Scale (0-30) 12 10
Mean disability according to Low Back Pain Rating Scale (0-100) 47 50
Duration of LBP at baseline
(inclusion criterion)
3-12 months 3-12 months
Type of occupation (mainly):   
Sitting 17% 12%
Mostly walking 40% 19%
Walking and some lifting 23% 28%
Heavy work 20% 40%