Table 5

Comparison of hazard rates from proportional hazards models for study populations in UK, Canada, and USA

Study	Disability level	Hazard rates rate (95% CI)
NECCPS^5-150	Severe cognitive disability	18.3 (6.5, 51.6)
SE Thames^5-151	Severely subnormal	4.7 (1.5, 14.7)
California child^5-151	Severe, profound mental retardation	1.4 (1.2, 1.6)
NECCPS^5-150	Severe manual disability	24.9 (7.5, 83.1)
California child^5-151	No functional hand use	1.5 (1.2, 1.8)
NECCPS^5-150	Severe ambulatory disability	21.9 (6.6, 73.0)
SE Thames^5-151	Immobile	10.8 (3, 34)
California child^5-151	Various immobile categories	2.4–7.8

Data from publications for SE Thames,6 paediatric Californian study,10 and British Columbia Registry.8
↵5-150 Univariate proportional hazards regression model.
↵5-151 Multivariate proportional hazards regression model.