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Table 2 Description of the studied samples in 2002 and 2010; Pelotas, RS, Brazil

From: Increase of chronic low back pain prevalence in a medium-sized city of southern Brazil

Variable   2002   2010
N %(CI 95%)** N %(CI 95%)**
Skin color     
White 2696 84.7(83.5-86.0) 2218 81.2(79.7-82.7)
Non white 486 15.3(14.0-16.5) 513 18.8(17.3-20.2)
Education (years)     
0 223 7.0(6.1-7.9) 184 6.7(5.8-7.7)
1-4 656 20.6(19.2-22.1) 494 18.1(16.6-19.5)
5-8 1067 33.6(31.9-35.2) 773 28.3(26.6-30.0)
9-11 780 24.5(23.0-26.0) 732 26.8(25.1-28.5)
≥ 12 451 14.2(13.0-15.4) 547 20.0(18.5-21.5)
Economic status     
High 747 23.6(22.1-25.0) 477 17.5(16.1-18.9)
Medium 1270 40.1(38.4-41.8) 1318 48.4(46.5-50.0)
Low 1153 36.3(34.7-38.0) 931 34.1(32.4-36.0)
Civil status     
Married/partner 1951 61.3(59.6-63.0) 1606 58.8(56.9-60.6)
Single/alone 1231 38.7(37.0-40.4) 1126 41.2(39.4-43.1)
Occupation     
Never worked - - 195 7.5(6.0-8.3)
Trade/sales - - 480 18.9(17.4-20.5)
Education - - 205 8.1(7.0-9.1)
Health - - 124 4.9(4.0-5.7)
Manufacturing - - 350 13.8(12.5-15.1)
Services - - 864 34.1(32.2-35.9)
Agriculture - - 66 2.6(2.0-3.2)
Cleaning - - 346 13.6(12.3-15.0)
Construction - - 99 3.9(3.1-4.7)
Smoking     
Never smoker 1668 52.4(50.7-54.2) 1495 54.7(52.8-56.6)
Former smoker 627 19.7(18.3-21.1) 654 24.0(22.3-25.5)
Current smoker 887 27.9(26.3-29.4) 583 21.3(19.8-22.9)
BMI*     
≤ 19.9 258 8.5(7.5-9.5) 115 4.7(3.9-5.5)
20-24.9 1284 42.1(40.4-43.9) 807 33.0(31.1-34.8)
25-29.9 1068 35.0(33.3-36.7) 888 36.3(34.4-38.2)
≥ 30 437 14.4(13.1-15.6) 638 26.0(24.3-27.8)
Insufficient physical activity §     
No 1837 58.9(55.1-62.7) 649 24.4(22.6-26.2)
Yes 1282 41.1(37.4-44.9) 2007 75.6(73.8-77.4)
Weight lifting/loading     
Never - - 975 38.5(36.6-40.4)
Sometimes - - 887 35.1(33.2-36.9)
Always - - 668 26.4(24.7-28.1)
Repetitiveness     
Never - - 387 15.3(13.9-16.8)
Sometimes - - 629 24.9(23.3-26.6
Always - - 1505 59.7(57.8-61.6)
Forced/Awkward posture     
Never - - 1072 42.4(40.4-44.3)
Sometimes - - 901 35.6(33.7-37.5)
Always - - 557 22.0(20.4-23.6)
Static posture     
Never - - 824 32.6(30.7-34.4)
Sometimes - - 842 33.3(31.4-35.1)
Always - - 863 34.1(32.3-36.0)
Stopped doing some activity §§     
No - - 154 48.4(42.9-54.0)
Yes - - 164 51.6(46.0-57.1)
Sought medical attention §§     
No - - 126 39.5(34.1-44.9)
Yes - - 193 60.5(55.1-65.9)
Missed work ||     
No - - 114 80.3(73.7-86.9)
Yes - - 28 19.7(13.1-26.3)
  1. *Body Mass Index.
  2. **95% Confidence Interval.
  3. § In 2002 physical activity refers to leisure, work, commuting and at home; in 2010, physical activity was only assessed for leisure time.
  4. §§ Data only for those who reported Chronic Low Back Pain in 2010.
  5. || Data only for those who reported Chronic Low Back Pain and were working in 2010.