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Table 6 Relative risk estimates i.e. the risk of sustaining a level of spasticity greater than or equal to 2 as compared to the year before, in different subgroups and age periods.

From: Development of spasticity with age in a total population of children with cerebral palsy

Population Age period and relative risk estimates
Total population < 4 yrs 4–12 yrs > 12 yrs
  1.15(1.06–1.26)* 0.87(0.85–0.89)* 1.08(0.97–1.19)
Total population – op excluded 1 < 6 yrs 6–12 yrs > 12 yrs
  1.08(1.02–1.13)* 0.84(0.80–0.87)* 1.06(0.94–1.20)
Spastic unilateral CP < 4 yrs 4–11 yrs > 11 yrs
  1.44(1.18–1.76)* 0.78(0.73–0.84)* 1.24(1.03–1.50)*
Spastic unilateral CP – op excluded 1 < 4 yrs 4–7 yrs > 7 yrs
  1.63(1.27–2.08)* 0.73(0.62–0.85)* 0.94(0.86–1.04)
Spastic bilateral CP < 3 yrs 3–12 yrs > 12 yrs
  1.33(1.07–1.64)* 0.88(0.86–0.91)* 1.06(0.93–1.21)
Spastic bilateral CP – op excluded 1 < 7 yrs 7–12 yrs > 12 yrs
  1.08(1.00–1.12) 0.83(0.77–0.89)* 1.09(0.92–1.27)
Dyskinetic CP < 6 yrs > 6 yrs  
  1.15(1.03–1.27)* 0.84(0.74–0.97)*  
Dyskinetic CP – op excluded 1 < 6 yrs > 6 yrs  
  1.23(1.09–1.39)* 0.76(0.70–0.83)*  
  1. In brackets 95% confidence interval.
  2. * p < 0.05 for the two-sided test of the relative risk being equal to 1.
  3. 1 excluded operations; SDR, ITB, TAL