Low return to play and performance in national football league athletes after Achilles tendon rupture: A systematic review

Table 2 Study characteristics and athlete demographics

Ref.	Level of evidence	Number of players	Number of Achilles	Years data collected	Age	Body mass index (kg/m2)	Years in national football league prior to acute Achilles tendon rupture (years)
Chopra et al[14], 2023	4	5	10	2007-2021	27.8	33.4	5.8
Krill et al[9], 2017	4	44	44	2009-2016	n/r	n/r	n/r
Parekh et al[8], 2009	4	28	31	1997-2002	29	n/r	6
Yang et al[10], 2019	3	80	80	2009-2014	25.6	n/r	3
Bi et al[4], 2023	4	52	52	2019-2021	n/r	n/r	n/r
Ready et al[11], 2021	4	101	101	2009-2016	26.7	31.7	n/r
McCullough et al[7], 2014	4	9	9	2012-2013	25.6	n/r	n/r
Jack et al[6], 2017	3	95	98	1958-2016	28.2	n/r	5.5
Krill et al[15], 2018	4	98	109	2010-2016	26	n/r	n/r
Trofa et al[5], 2017	3	21	21	1988-2012	29.4	33.3	6
Mai et al[13], 2016	4	80	80	2003-2013	27.2	32	4.6
Barton et al[12], 2023	3	63	63	2009-2015	n/r	n/r	n/r

n/r: Not recorded.