• Anita B Amorim, Paulo H Ferreira, Manuela L Ferreira, Ragnhild Lier, Milena Simic, Evangelos Pappas, Joshua R Zadro, Paul Jarle Mork, and Tom Il Nilsen.
• Faculty of Health Sciences, The University of Sydney, Discipline of Physiotherapy, Sydney, New South Wales, Australia.
• BMJ Open. 2018 Oct 18; 8 (10): e022785.

ObjectivesTo investigate the influence of parental chronic spinal pain on prognosis of chronic spinal pain in adult offspring, and whether offspring physical activity level and body mass index (BMI) modified this association.DesignProspective cohort study.SettingWe used family-linked longitudinal data from the Norwegian HUNT study collected in HUNT2 (1995-1997) and HUNT3 (2006-2008).ParticipantsA total of 1529 offspring who reported spinal pain in HUNT2 were linked with parental data and followed up in HUNT3.OutcomesWe estimated relative risk (RR) with 95% CI for recovery from chronic spinal pain, and also from activity limiting spinal pain, in offspring related to chronic spinal pain in parents. We also investigated whether offspring leisure time physical activity and BMI modified these intergenerational associations in spinal pain.ResultsA total of 540 (35%) offspring were defined as recovered after approximately 11 years of follow-up. Offspring with both parents reporting chronic spinal pain were less likely to recover from chronic spinal pain (RR 0.83, 95% CI 0.69 to 0.99) and activity limiting spinal pain (RR 0.71, 95% CI 0.54 to 0.94), compared with offspring of parents without chronic spinal pain. Analyses stratified by BMI and physical activity showed no strong evidence of effect modification on these associations. However, offspring who were overweight/obese and with both parents reporting chronic spinal pain had particularly low probability of recovery from activity limiting spinal pain, compared with those who were normal weight and had parents without chronic spinal pain (RR 0.57, 95% CI 0.39 to 0.84).ConclusionOffspring with chronic spinal pain are less likely to recover if they have parents with chronic spinal pain, particularly if offspring are overweight/obese.© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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