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.

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)*