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Table 2 Predictors for fibromyalgia symptoms in the sub-sample with regional pain data from both 1975 and 1981 (5894 individuals)

From: Predictors of fibromyalgia: a population-based twin cohort study

  Univariate analysesa Multivariate analyses
OR (95 % CI) for LC3 OR (95 % CI) for LC3 1975 variable data OR (95 % CI) for LC3 1981 variable data
n = 374 “cases”/ 5894 persons n = 353 “cases” n = 346 “cases”
headache frequency 1981   not assessed  
 many /week 11.33 (6.63–19.35)   6.79 (3.73–12.37)
 1–4 /month 2.66 (1.91–3.69)   2.06 (1.44–2.94)
 some/year 1.78 (1.31–2.41)   1.53 (1.11–2.13)
 never 1.00 (reference category)   1.00
back pain (yes/no)
 both 1975 and 1981 6.33 (4.55–8.81) 5.20 (3.67–7.38) 4.67 (3.28–6.67)
 either 1975 or 1981 2.28 (1.77–2.94) 1.97 (1.51–2.59) 1.85 (1.41–2.44)
 never 1.00 (reference category) 1.00 1.00
shoulder pain (yes/no)
 both 1975 and 1981 4.65 (2.41–8.97) 2.10 (1.02–4.34) 1.89 (0.89–4.02)
 either 1975 or 1981 2.38 (1.77–3.19) 1.56 (1.12–2.16) 1.51 (1.08–2.12)
 never 1.00 (reference category) 1.00 1.00
neck pain (yes/no)
 both 1975 and 1981 5.78 (3.42–9.75) 3.80 (2.11–6.83) 3.32 (1.83–6.02)
 either 1975 or 1981 2.23 (1.66–2.99) 1.69 (1.22–2.33) 1.51 (1.09–2.09)
 never 1.00 (reference category) 1.00 1.00
  1. The reference category for the outcome is LC1, i.e. those with no or very few fibromyalgia symptoms [12]. Odds ratios and 95 % confidence intervals are provided for LC3 (with many fibromyalgia symptoms), based on latent class (LC) analyses in 1990. Predictors are assessed from data collected in 1975 and 1981 with the exception of headache frequency, which was only from the 1981 survey
  2. aadjusted for age and gender