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Table 1 Definitions of outcomes, sample size and status at baseline and follow-ups in the study

From: The age- and sex-specific occurrence of bothersome neck pain in the general population – results from the Stockholm public health cohort

Outcome Sample at riska, n Baseline Follow-up
One-year prevalence of short-duration BNP in 2006 10,083 men and 12,765 women The proportion of individuals in the cohort having experienced at least one episode of BNP in at least 7 consecutive days, but less than 3 consecutive months in 2006 according to a retrospective question in the follow-up questionnaire in 2007 -
One-year prevalence of long-duration BNP in 2006 10,298 men and 13,146 women The proportion of individuals in the cohort having experienced constant or at least one episode of bothersome neck pain in at least 3 consecutive months in 2006 according to a retrospective question in the follow-up questionnaire in 2007 -
One-year prevalence of short- and/or long-duration BNP in 2006 10,123 men and 12,878 women The proportion of individuals in the cohort having experienced at least one episode of short-duration BNP and/or long-duration BNP in 2006 according to a retrospective question in the follow-up questionnaire in 2007 -
Incidence proportion of short- and/or long-duration BNP in 2006 8,747 men and 10,105 women Individuals without short or long- duration BNP in 2005 according to a retrospective question in the follow-up questionnaire in 2007. The proportion of episodes (1-2 episodes per individual) in the cohort of short- and/or long-duration BNP in 2006 according to a retrospective question in the follow-up questionnaire in 2007
Incidence proportion of recovery from short- and/or long-duration BNP in 2006 1,358 men and 2,728 women Individuals with short- and/or long-duration BNP in 2005 according to a retrospective question in the follow-up questionnaire in 2007 The proportion of individuals without short- or long-duration BNP in 2006 according to a retrospective question in the follow-up questionnaire in 2007
  1. aThose in the cohorts that have answered the different questions about neck pain.