Table 2

Sample characteristics at T0
Overall (N = 531) Lumbal disc (N = 419) Cervical disc (N = 112)
Without psychiatric comorbiditiy (N = 445) With psychiatric comorbidity (N = 86) Without psychiatric comorbiditiy (N = 352) With psychiatric comorbidity (N = 67) Without psychiatric comorbiditiy (N = 93) With psychiatric comorbidity (N = 19)
Age (mean (SD)) 42.6 (7.87) 41.4 (8.34) a 41.8 (8.05) 40.5 (8.78) a 45.5 (6.35) 44.6 (5.63) a
Number of children (mean (SD) 1.41 (0.98) 1.43 (2.28) a 1.37 (1.00) 1.13 (0.99) a 1.55 (0.89) 2.47 (4.41) a
Number of previous disc herniations (mean (SD)) 1.61 (1.62) 2.70 (10.3) a 1.64 (1.73) 3.00 (11.6) a* 1.51 (1.12) 1.59 (1.33) a
Number of previous disc surgery (mean (SD)) 0.22 (0.58) 0.29 (0.62) a 0.22 (0.58) 0.37 (0.68) a 0.18 (0.57) 0 (0) a**
Psychiatric comorbidity
---ICD-10 chapter F0 (N (%)) - 3 (1) - 3 (1) - 0 (0)
---ICD-10 chapter F1 (N (%)) - 11 (2) - 7 (2) - 4 (4)
---ICD-10 chapter F3 (N (%)) - 56 (11) - 44 (11) - 12 (11)
---ICD-10 chapter F4 (N (%)) - 47 (9) - 38 (9) - 9 (8)
Self reported chronic medical disease (N (%))
---Yes (ref: No) 170 (38) 36 (42) b 229 (65) 45 (67) b 46 (49) 5 (26) b
Gender (N (%)
---Male 179 (60) 47 (45) b* b* 214 (61) 32 (48) b* 52 (56) 7 (37) b
Education (N (%))
---ISCED level 2 or lower 7 (2) 4 (5) b 6 (2) 4 (6) b 1 (1) 0 (0) b
---ISCED level 3 306 (69) 57 (66) 240 (68) 48 (72) 66 (71) 9 (47)
---ISCED level 5 or higher 132 (30) 25 (29) 106 (30) 15 (22) 26 (28) 10 (53)
Marital status (N (%))
Married (ref: alone) 264 (59) 35 (41) b** b**205 (58) 23 (34) b*** 59 (63) 12 (63) b
Living situation (N (%))
---Living alone 68 (15) 24 (28) b** b**53 (15) 19 (28) b* 15 (16) 5 (26) b
---Living with partner/parents 364 (82) 58 (67) 290 (82) 45 (67) 74 (80) 13 (68)
---Other living situation 13 (3) 4 (5) 9 (3) 3 (4) 4 (4) 1 (%)
Employment status (N (%))
---Employed (ref: unemployed) 371 (83) 54 (63) b*** b***296 (84) 40 (59) b*** 75 (81) 14 (74) b
Type of health insurance (N (%))
---Statutory health insurance 381 (86) 81 (94) b* b*308 (87) 62 (93) b 73 (78) 19 (100) b*
---Private health insurance 64 (14) 5 (6) 44 (13) 5 (7) 20 22) 0 (0)

aT-test; b Chi-square test; ISCED: international standard classification of education; SD: standard deviation; * p < .05; ** p < .01; *** p < .001.

Konnopka et al.

Konnopka et al. BMC Musculoskeletal Disorders 2012 13:165   doi:10.1186/1471-2474-13-165

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