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Table 3 Pairwise analyses of odds ratios (with 95 % confidence intervals) for future classification in latent class 3 (LC3) with FM symptoms (in 1990) in twin pairs discordant for this classification (LC3 vs. LC1). Predictors are assessed from 1981

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

Predictor Odds ratios (with 95 % confidence intervals) for LC3 by zygosity
All discordant twin pairs Dizygotic twin pairs Monozygotic twin pairs
OR (95 % CI) n OR (95 % CI) n OR (95 % CI) n
back pain (yes/no) 2.7 (1.4–5.2) 117 2.3 (1.1–4.6) 86 5.0 (0.6–42.8) 23
shoulder pain (yes/no) 3.1 (1.3–7.4) 91 8.0 (1.8–34.8) 64 1.0 (0.3–3.5) 23
neck pain (yes/no) 4.0 (1.5–10.7) 92 5.0 (1.4–17.3) 64 2.0 (0.4–10.9) 24
poor sleep 1.4 (0.4–4.4) 144 1.3 (0.3–6.0) 104 1.5 (0.3–9.0) 31
good sleep 1.0 reference category   1.0   1.0  
BMI   143   103   31
 overweight 1.9 (1.0–3.8)   1.6 (0.8–3.3)   5.0 (0.6–42.8)  
 underweight 0.5 (0.0–5.5)   0.5 (0.0–5.5)   omitteda  
 normal weight 1.0 reference category   1.0   1.0  
headache (yes/no) 2.1 (1.0–4.1) 132 2.2 (1.0–4.9) 97 2.5 (0.5–12.9) 27
  1. n number of twin pairs discordant for each variable, LC3 those with many fibromyalgia symptoms, LC1 those with no or few fibromyalgia symptoms
  2. Sums of dizygotic and monozygotic pairs do not equal the sums of all discordant twin pairs, because the zygosity of some pairs remained uncertain
  3. aNumber of individuals in this category was too small for an adequate analysis