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Table 7 Relative risk estimates i.e. the odds 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
  1.10(1.00–1.20)* 0.85(0.82–0.87)* 1.07(0.97–1.20)
Total population – op excluded 1 < 6 yrs 6–12 yrs > 12 yrs
  1.04(0.98–1.10) 0.84(0.80–0.88)* 1.10(0.96–1.25)
Spastic unilateral CP < 4 yrs 4–11 yrs > 11 yrs
  1.29(1.05–1.58)* 0.76(0.71–0.82)* 1.29(1.05–1.57)*
Spastic unilateral CP – op excluded 1 < 4 yrs 4–7 yrs > 7 yrs
  1.46(1.14–1.88)* 0.65(0.54–0.77)* 0.96(0.87–1.06)
Spastic bilateral CP < 3 yrs 3–12 yrs > 12 yrs
  1.24(1.00–1.55)* 0.86(0.83–0.86)* 1.08(0.94–1.024)
Spastic bilateral CP – op excluded 1 < 7 yrs 7–12 yrs > 12 yrs
  1.04(0.98–1.11) 0.83(0.77–0.90)* 1.13(0.95–1.33)
Dyskinetic CP < 6 yrs > 6 yrs  
  1.28(1.13–1.45)* 0.82(0.76–0.88)*  
Dyskinetic CP – op excluded 1 < 6 yrs > 6 yrs  
  1.39(1.21–1.60)* 0.80(0.73–0.88)*  
  1. Estimates corrected for potential differences in risk of separate birth cohorts. 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