Aittomäki A, Lahelma E, Rahkonen O, Leino-Arjas P, Martikainen P.
The contribution of musculoskeletal disorders and physical work load to socioeconomic inequalities in health. Eur J Public Health 2006, Sep 5 [Epub ahead of print].

Dionne CE, von Korff M, Koepsell TD, Deyo RA, Barlow WE, Checkoway H.
Formal education and back pain: a review. J Epidemiol Community Health 2001;55:455-68.

Feeney A, North F, Head J, Canner R, Marmot M.
Socioeconomic and sex differentials in reason for sickness absence from the Whitehall II study. Occup Environ Med 1998;55:91-8.

Hagen KB, Holte HH, Tambs K, Bjerkedal T.
Socioeconomic factors and disability retirement from back pain: a 1983-1993 population-based prospective study in Norway. Spine 2000 Oct 1;25(19):2480-7.

Hagen KB, Tambs K, Bjerkedal T.
What mediates the inverse association between education and occupational disability from back pain? A prospective cohort study from the Nord-Trondelag health study in Norway. Soc Sci Med 2006;63:1267-75.

Heliövaara M, Mäkelä M, Sievers K, Melkas T, Aromaa A, Knekt P, Impivaara O, Aho K, Isomäki H.
Tuki- ja liikuntaelinten sairaudet Suomessa. Helsinki: Kansaneläkelaitoksen julkaisuja AL:35, 1993.

Kaila-Kangas L, Keskimäki I, Notkola V, Mutanen P, Riihimäki H, Leino-Arjas P.
How consistently distributed are the socioeconomic differences in severe back morbidity by age and gender? A population based study of hospitalisation among Finnish employees. Occup Environ Med 2006;63:278-82.

Latza U, Kohlmann T, Deck R, Raspe H.
Influence of occupational factors on the relation between socioeconomic status and self-reported back pain in a population-based sample of German adults with back pain. Spine 2000;25:1390-7.

Latza U, Kohlmann T, Deck R, Raspe H.
Can health care utilization explain the association between socioeconomic status and back pain? Spine 2004;29:1561-6.

Leino-Arjas P, Hänninen K, Puska P.
Socioeconomic variation in back and joint pain in Finland. Eur J Epidemiol 1998;14:79-87.

Leino-Arjas P, Kaila-Kangas L, Notkola V, Keskimäki I, Mutanen P.
Inpatient hospital care for back disorders in relation to industry and occupation. Scand J Work Environ Health 2002;28:304-313.

Mustard CA, Kalcevich C, Frank JW, Boyle M.
Childhood and early adult predictors of risk of incident back pain: Ontario Child Health Study 2001 follow-up. Am J Epidemiol 2005;162:779-86.