Table 4

CONcheck and readability summary

Website	CONcheck item											CONcheck total score /22	Readability
Website	1	2	3	4	5	6	7	8	9	10	11	CONcheck total score /22	Flesch Reading Ease (0–100)	Flesch–Kincaid Grade Level (1–12)
Sports Concussion South Africa	2	2	2	2	2	2	2	2	2	2	2	22	33	14.3
Caring for Kids	2	2	2	2	2	2	2	2	2	2	2	22	55.4	9.3
Moms Team	2	2	2	2	2	2	2	2	2	2	2	22	53.9	10.1
Heads Up	2	2	2	2	2	2	2	2	2	2	2	22	63	8
Think First Canada	2	2	2	2	2	2	2	2	2	2	2	22	49.5	9.7
Brain Injury Association of Canada	2	2	2	2	2	2	2	2	2	2	2	22	46.4	11.3
Accident Compensation Corporation (ACC)	2	2	2	1	2	2	2	2	2	2	2	21	45.8	10.4
International Ice Hockey Federation (IIHF)	2	2	2	2	2	2	2	2	2	2	1	21	24	15.6
Cogstate Sport	0	2	2	2	2	2	2	2	2	2	2	20	56.7	8
Australian Rules Football	*	2	2	2	2	2	1	2	2	2	2	19	47.3	10.8
Teens Health	0	2	2	2	*	2	2	2	2	2	2	18	41.3	12.8
Brain Injury Association of New Jersey	2	2	2	2	2	0	2	0	2	2	2	18	60.2	8.9
Brainline	2	2	2	*	2	*	2	2	2	2	2	18	64.7	8
KidsHealth	0	2	2	2	2	2	2	2	0	2	1	17	33.5	12.9
ImPACT	2	2	2	2	2	2	2	0	2	0	1	17	77.4	6
American Family Physician	0	2	2	2	2	*	2	2	0	2	2	16	16.3	17.8
Brain Injury Association of New Zealand	2	2	2	0	2	2	1	2	0	2	1	16	71.5	6.5
Wikipedia	2	2	2	0	0	0	2	2	2	0	2	14	27.7	13.4
Mayo Clinic	2	2	2	0	*	*	2	2	0	2	1	13	64.8	8.5
WebMD	*	2	2	2	2	*	2	0	0	2	0	12	28.6	14.9
Medicine.net	2	2	2	2	0	2	0	0	0	2	0	12	63.1	8.2
All About Traumatic Brain Injury	2	2	2	2	2	2	0	0	0	0	0	12	47.6	10.4
Science Daily	2	2	2	0	0	2	0	0	2	0	2	12	45.8	10
Brain Injury Association-USA	2	2	2	2	2	0	0	0	0	2	0	12	26.7	15
Sports Concussion Institute	1	2	2	0	*	0	2	0	0	2	2	11	54.5	9.3
Headway	0	*	2	0	1	2	2	2	0	2	0	11	58.6	10
Brain Injury Resource Centre	0	2	1	1	2	*	2	2	0	0	0	10	64.7	8.5
Family Doctor.Org	*	2	1	0	*	2	0	2	0	2	0	9	52.7	10.2
GoogleHealth	*	2	2	0	*	0	2	1	0	2	0	9	60.8	8.7
YahooHealth	*	2	2	0	*	0	2	1	0	2	0	9	49.6	11.6
eMedicineHealth.com	*	2	2	0	2	0	0	2	0	0	0	8	48.4	11.5
Medic8	2	1	2	*	0	*	1	2	0	0	*	8	41.7	11.5
MedlinePlus	1	2	*	0	*	0	2	0	*	2	0	7	29.2	15.8
BBC Health	*	2	2	0	0	*	0	0	0	0	*	4	40.1	12.4
Netdoctor	*	*	*	0	*	0	2	*	0	0	0	2	39.7	13.5
Automated Neuropsychological Assessment Metrics	1	0	1	0	0	0	0	0	0	0	0	2	35.4	13.3
Brain Injury Australia	0	0	0	0	0	0	0	0	0	0	0	0	66	8.4
Fédération Internationale de Football Association (FIFA)	0	0	0	0	0	0	0	0	0	0	0	0	29.1	15.1
International Olympic Committee (IOC)	0	0	0	0	0	0	0	0	0	0	0	0	45.7	12.6
International Rugby Board (IRB)	0	0	0	0	0	0	0	0	0	0	0	0	36.4	12.3
World Boxing Council (WBC)	0	0	0	0	0	0	0	0	0	0	0	0	31.6	13.4
Federation Internationale de L'Automobile (FIA)	0	0	0	0	0	0	0	0	0	0	0	0	51.7	9.3
Headminder	0	0	0	0	0	0	0	0	0	0	0	0	38.9	12.1
Frequency of CONcheck score: N (%)
0=Absent	13 (30)	8 (19)	7 (16)	21 (49)	13 (30)	17 (40)	15 (35)	18 (42)	26 (60)	17 (40)	20 (47)
1=Present but incomplete	3 (7)	1 (2)	3 (7)	2 (5)	1 (2)	0	3 (7)	2 (5)	0	0	5 (12)
2=Present and Complete	19 (44)	32 (74)	31 (72)	18 (42)	21 (49)	19 (44)	25 (58)	22 (51)	16 (37)	26 (60)	16 (37)
*=Inaccurate	8 (9)	2 (5)	2 (5)	2 (5)	8 (19)	7 (16)	0	1 (2)	1 (2)	0	2 (5)
Mean												11.86	46.95	11.17
Standard Deviation												7.61	14.23	2.72