Table 3.

Subgroup of ischaemic strokes or TIA stratified by age groups (demographic characteristics, risk factors, and stroke subtypes)

	Total groups		Age 18-34 years		Age 35-44 years		Age 45-55 years
	sifap1(n = 4467)	GQH(n = 14522)	sifap1(n = 563)12.6%	GQH(n = 1049)7.2%***	sifap1(n = 1224)27.4%	GQH(n = 2962)20.4%***	sifap1(n = 2680)60%	GQH(n = 10511)72.4%***
Sex (males); (n = 4467, Sifap1)	59.4%	61.2%*	42.8%	46.3%	57.9%	57.9%	63.5%	63.5%
Age (years); mean, median and 25th-75th percentile (n = 4467, Sifap1)	44.747 (40-51)	47.5*** 50 (44-53)	28.329 (25-32)	28.4 29 (25-32)	40.541 (38-43)	40.6 41 (39-43)	50.150 (47-53)	51.4*** 51 (48-53)
Previous cerebrovascular event (n = 4466, Sifap1)	16.9%	11.9%***	12.8%	7.7%**	15.4%	8.2%***	18.6%	13.3%***
Proportion of TIA (n = 4467, Sifap1)	24.0%	36.4%***	21.8%	41.5%***	25.1%	39.7%***	23.9%	34.9%***
Vascular risk profile
Hypertension (n = 4439, Sifap1)	46.6%	49.5%**	13.1%	11.6%	36.7%	31.7%**	58.2%	58.2%
Diabetes mellitus (n = 4443, Sifap1)	10.3%	14.4%***	2.0%	3.1%	7.7%	8.6%	13.3%	17.1%***
Current smoking (n = 4466, Sifap1)	42.5%	40.8%*	37.5%	33.5%	42.1%	41.3%	43.8%	41.5%
Stroke subtypes according to TOAST	n = 4345	n = 14169	n = 555	n = 1006	n = 1201	n = 2902	n = 2589	n = 10261
Atherosclerosis	16.4%	22.3%***a	4.1%	8.8%***a	10.4%	13.6%***a	21.8%	26%***a
Cardiac embolic source	15.1%	12.1%	18.6%	15.3%	17.7%	13.4%	13.2%	11.4%
Small artery occlusion	13.7%	19.2%	6.3%	8.2%	9.5%	13.7%	17.2%	21.8%
Other determined cause	16.5%	9.8%	24.5%	16.7%	20.8%	14.3%	12.8%	7.8%
Undetermined cause	38.3%	36.7%	46.5%	51.0%	41.6%	45.0%	34.9%	33.0%

*p < 0.05.

**p < 0.01.

***p < 0.001.

^athe test statistic was calculated by using all five TOAST classification categories.