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Table 1 MDQ symptoms score and prevalence of mood elevation symptoms in survey sample

From: The common bipolar phenotype in young people

  Probable bipolar (N= 106) Threshold bipolar (N= 459) Difference Significance
MDQ symptoms score: mean (s.d.) 9.7 (1.9) 8.5 (1.5) 1.17 F = 48.135, p < 0.001; η2 = 0.079
Frequency of occurrence of individual symptoms     
Marked differences     
  Hyper behaviour leading to trouble (%) 81 50 31 LR = 35.847, p < 0.001; ϕ = 0.242
  Risk-taking behaviour (%) 82 58 24 LR = 23.732, p < 0.001; ϕ = 0.196
  Irritability leading to shouting (%) 79 56 23 LR = 21.606, p < 0.001; ϕ = 0.189
  Irresponsible spending (%) 27 7 20 LR = 30.162, p < 0.001; ϕ = 0.256
Slight differences     
  Racing thoughts (%) 85 73 12 LR = 7.146, p = 0.008; ϕ = 0.108
  Distractibility (%) 90 80 10 LR = 6.491, p = 0.011; ϕ = 0.101
Minor or no differences     
  Increased interest in sex (%) 70 65 5 LR = 1.098, p = 0.295; ϕ = 0.044
  Increased talkativeness (%) 80 75 5 LR = 1.340, p = 0.247; ϕ = 0.048
  Increased sociability (%) 61 61 0 LR = 0.004, p = 0.952; ϕ = 0.003
  Increased confidence (%) 84 85 -1 LR = 0.041, p = 0.840; ϕ = -0.009
  Decreased need for sleep (%) 68 69 -1 LR = 0.074, p = 0.786; ϕ = -0.011
  Increased energy (%) 85 88 -3 LR = 0.625, p = 0.429; ϕ = -0.034
  Increased activity (%) 73 83 -10 LR = 5.095, p = 0.024; ϕ = -0.098
  1. s.d., standard deviation; LR, likelihood ratio; df = 563 for MDQ symptoms score or df = 1 for other variables.