Table 4.

Frequency of and risk difference for developing complications according to stroke severity on admission

	2003			2013
Stroke severity	No. of patients	One or more complications		No. of patients	One or more complications		RD	95 % CI
		n	%		n	%
Very severe	61	50	82.0	26	24	92.3	−0.10	−0.23 to 0.08
Severe	58	45	77.6	24	16	66.7	0.11	−0.09 to 0.33
Moderate	111	82	73.9	58	26	44.8	0.29	0.43 to 0.14
Mild	124	50	40.7	49	13	26.5	0.14	−0.02 to 0.27
Very mild	135	25	18.4	28	5	17.9	0.01	−0.18 to 0.13
p-value for trenda			<0.001			<0.001

Very severe: Scandinavian Stroke Scale (SSS) = 0–14, severe: SSS = 15–29, moderate: SSS = 30–44, mild: SSS = 54–51, very mild: SSS = 52–59

RD risk difference

^aCochran-Armitage test for trend