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Table 1 Baseline characteristics of all invited subjects, responders at T1a, responders at both T1 and T2b, and the final prospective sample after exclusionc

From: Psychological predictors of change in the number of musculoskeletal pain sites among Norwegian employees: a prospective study

  All invited (N = 10274) Responders at T1 (n = 6198) Association with non-response at T1 Responders at both T1 and T2 (n = 4204) Association with dropout after T1d Prospective sample after exclusion (n = 2989)
N (%) N (%) OR 95% CI N (%) OR 95% CI N (%)
Sex
 Male 3852 (37.5) 2405 (38.8) ref - 1681 (40.0) ref - 1161 (38.8)
 Female 6422 (62.5) 3793 (61.2) 1.16 [1.07–1.26]** 2523 (60.0) 1.02 [0.89–1.17] 1828 (61.2)
Age
  < 30 796 (7.7) 451 (7.3) ref - 269 (6.4) ref - 196 (6.6)
 30–39 2519 (24.5) 1556 (25.1) 0.81 [0.69–0.95]* 1048 (24.9) 0.82 [0.63–1.07] 733 (24.5)
 40–49 3118 (30.3) 1933 (31.2) 0.80 [0.68–0.94]** 1330 (31.6) 0.72 [0.55–.95]* 970 (32.5)
 50–59 2973 (28.9) 1775 (28.6) 0.89 [0.76–1.04] 1230 (29.3) 0.74 [0.56–.97]* 870 (29.1)
  > 59 868 (8.4) 483 (7.8) 1.06 [0.87–1.28] 327 (7.8) 0.83 [0.60–1.17] 220 (7.4)
Marital status
 Not married   618 (13.1)    444 (13.8) ref - 309 (13.5)
 Married   2893 (61.2)    1982 (61.6) 1.21 [0.99–1.49] 1410 (61.6)
 Cohabiting   764 (16.2)    499 (15.5) 1.32 [1.04–1.67] 370 (16.2)
 Widowed   62 (1.3)    40 (1.2) 1.40 [0.78–2.51] 26 (1.1)
 Divorced   313 (6.6)    203 (6.3) 1.34 [0.98–1.82] 137 (6.0)
 Separated   75 (1.6)    47 (1.5) 1.47 [0.88–2.46] 38 (1.7)
 Missing data   1473 -    989 - - - 699 -
Occupation
 Professionals   1757 (29.0)    1283 (31.3) ref - 904 (30.9)
 Armed forces and unspecified   32 (0.5)    20 (0.5) 1.78 [0.83–3.82] 15 (0.5)
 Legislators, senior officials and managers   587 (9.7)    464 (11.3) 0.81 [0.62–1.05] 307 (10.5)
 Technicians and associate professionals   2040 (33.7)    1323 (32.3) 1.66 [1.41–1.95]** 954 (32.6)
 Clerks   501 (8.3)    313 (7.6) 1.73 [1.36–2.21]** 244 (8.3)
 Service workers and shop and market sales workers   979 (16.2)    605 (14.8) 1.70 [1.40–2.05]** 443 (15.2)
 Skilled agricultural and fishery workers   2 (0.0)    1 (0.0) 2.85 [0.17–46.49] 0 (0.0)
 Craft and related trades workers   67 (1.1)    43 (1.0) 2.11 [1.19–3.75]* 29 (1.0)
 Plant and machine operators and assemblers   8 (0.1)    3 (0.1) 4.86 [0.81–29.35] 2 (0.1)
 Elementary occupations   76 (1.3)    45 (1.1) 2.10 [1.26–3.50]** 26 (0.9)
 Missing data   149 -    104 - - - 65 -
Skill level
  > 15 years   1757 (29.0)    1283 (31.3) ref - 904 (30.9)
 13–15 years   2040 (33.7)    1323 (32.3) 1.66 [1.41–1.95]** 954 (32.6)
 10–12 years   1557 (25.7)    965 (23.5) 1.73 [1.46–2.05]** 718 (24.6)
  < 10 years   76 (1.3)    45 (1.1) 2.10 [1.26–3.50]** 26 (0.9)
 Unspecified   619 (10.2)    484 (11.8) 0.86 [0.67–1.10] 322 (11.0)
 Missing data   149 -    104 - - - 65 -
Number of pain sites at T1
 0   1446 (23.3)    1001 (23.8) ref - -
 1   1359 (21.9)    962 (22.9) 0.86 [0.71–1.04] 962 (32.2)
 2   1299 (21.0)    884 (21.0) 0.99 [0.82–1.20] 884 (29.6)
 3   1082 (17.5)    706 (16.8) 1.13 [0.92–1.38] 706 (23.6)
 4   680 (11.0)    437 (10.4) 1.13 [0.90–1.41] 437 (14.6)
 5   332 (5.4)    214 (5.1) 1.21 [0.90–1.63] -
  1. *p<0.05, **p<0.01
  2. aResponse at T1 was defined as having completed all five pain items at T1
  3. bResponse at both T1 and T2 was defined as having completed all pain items at both T1 and T2
  4. cThe final prospective sample comprised employees that participated at both T1 and T2 and that reported at least one but no more than four pain sites at T1
  5. dAssociation with dropout was computed among T1 responders by multivariable logistic regressions with all predictors included simultaneously, except skill level and occupation which were entered separately since they were different categorizations of the same variable. ‘’Dropout” was defined as responding at T1, but not volunteering information about all five studied pain sites at T2