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Table 3
Change in disability rates is attributable to period effect and the aging population from 2001 to 2006

Severity of disability	Total Change (2001 to 2006)	Period effect	Age composition of population	Interaction
	(a)	= (b)	+ (c)	+ (d)
	percentage points
Overall	1.95*	1.21*	0.71*	0.02
% of total	100	62	37	1
Severity of disability
Mild	0.89*	0.68*	0.20*	0.00
% of total	100	77	23	0
Moderate	0.45*	0.28*	0.16*	0.01
% of total	100	62	36	1
Severe	0.43*	0.21	0.21*	0.02
% of total	100	48	48	4
Very Severe	0.17	0.04	0.13*	0.00
% of total	100	23	77	0
* significantly different from 0 at p < 0.05 Note: Due to rounding, percentages may not add up to 100%. Sources: Statistics Canada, Participation and Activity Limitation Survey, 2001 and 2006.