Table 1. Total studies included.

N: Neurological outcome; S: Survival outcome; EMS: Emergency medical service; NA: Not available

Study ID	Country	Total Number of Participants	Bystander Survival (S) or Neurological Outcome (N)	EMS Survival (S) or Neurological Outcome (N)
Myerburg et al. 2002 [5]	United States	420	17% S	9% S
Nakahara et al. 2015 [6]	Japan	167912	40.70% S	15% S
Mitani et al. 2014 [7]	Japan	NA	69% N	35% N
Kiyohara et al. 2017 [8]	Japan	NA	77% S	35% S
Sun et al. 2020 [9]	Denmark	653	32.30% S	NA
Myat et al. 2019 [10]	Australia	1299784	37.7% N	22.6% N
Nakashima et al. 2019 [11]	Japan	28019	44% S	31.80% S
Kishimori et al. 2020 [12]	Japan	1743	29.8% N	9.7% N
Siddiq et al. 2013 [13]	Canada	1310	12.20% S	NA
Caffrey et al. 2002 [14]	United States	354	13% S	7% S
Culley et al. 2004 [15]	United States	NA	50% S	NA
Haskins et al. 2020 [16]	Australia	NA	55.50% S	28.80% S
Kiguchi et al. 2019 [17]	Japan	NA	51.80% S	25.50% S
Kitamura et al. 2010 [18]	Japan	312,319	86% S	78% S
Kiyohara et al. 2019 [19]	Japan	409	52.20% S	NA
Swor et al. 2013 [20]	United States	47	15.10% S	NA
Ringh et al. 2015 [21]	Sweden	6532	70% S	31% S
Murakami et al. 2014 [22]	Japan	6190	10% S	NA
Agerskov et al. 2015 [23]	Denmark	2080	71.40% S	NA
Kiyohara et al. 2016 [24]	Japan	9978	19.4%N	3% N
Nielsen et al. 2013 [25]	Denmark	NA	69% S	NA
Capucci et al. 2016 [26]	Italy	3271	41.40% S	5.90% S
Torney et al. 2020 [27]	UK	NA	30.10% S	16% S
Iwami 2012 [28]	Japan	NA	38.50% S	18.20% S
Sun et al. 2019 [29]	Denmark	673	31.30% S	NA
Kitamura et al. 2016 [30]	Japan	NA	38.5% N	18.2% N
Haskins et al. 2022 [31]	Australia	NA	39.60% S	24.20% S
Marenco et al. 2001 [32]	Canada	2172	40.10% S	NA
Shibahashi et al. 2021 [33]	Japan	562	61.20% S	NA
Odom et al. 2022 [34]	United States	NA	19.70% S	13.80% S