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Table 1 The prevalence estimates of different definitions of spinal pain in a study of 34,902 Danish twin individuals.

From: Pain in the lumbar, thoracic or cervical regions: do age and gender matter? A population-based study of 34,902 Danish twins 20–71 years of age

Definition of variables N (%)*
LBP ever 20,053 (57%)
LBP past year 15,093 (43%)**
LBP 1–7 days 3,804 (10%)
LBP 8–30 days 6,168 (18%)
LBP >30 days 4,207 (12%)
Pain radiating into leg(s) 7,651 (22%)
MBP ever 5,966 (17%)
MBP past year 4,535 (13%) **
MBP 1–7 days 1,161 (3%)
MBP 8–30 days 1,633 (5%)
MBP >30 days 1,338 (4%)
Pain radiating into chest 1,846 (5%)
NP ever 14,059 (40%)
NP past year 11,316 (32%) **
NP 1–7 days 2,523 (7%)
NP 8–30 days 4,345 (12%)
NP >30 days 3,641 (10%)
Pain radiating into arm(s) 5,583 (16%)
  1. * Because of the large sample size, confidence intervals would be very narrow (usually 1 unit), and have therefore not been included in the table.
  2. ** The number of days for 1–7 days, 8–30 days and >30 days do not add up to the year-estimates, because the latter have been corrected, if data were missing, based on subsequent answers in relation to site-specific consequences in the past year.