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.

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)*