Table 2.

Study demographics

Author	Total number of participants	Age range (years)	Female (%)
Single cohort (TKA or THA) studies
Fu [33]	34,800	18 to > 80	63.2%
Curtis [32]	111,624	N/R	Control 63% Heart failure 55%
Chamieh [35]	41,334	18 to > 80	No anaemia 64.1% Any anaemia 62.5%
Godoy [31]	317	40 to 91	N/R
Abdel [29]	4718	Not specified	Obese 65.7% Non-obese 54%
Meller (TKA) [34]	585,127	65 to > 85	Normal weight 62% Morbidly obese 75% Super obese 82%
Meller (THA) [17]	432, 841	65 to > 85	Normal 62% Morbidly obese 68% Super obese 77%
Combined cohort (TKA and THA) studies
Waterman [12]	34,066	N/R	TKA 63% THA 56%
Robinson [6]	54,502	18 to > 75	TKA 62.3% THA 54.9%
Feng [4]	4414	38 to 82	72%
Thornqvist [8]	34,744	59 to 82	59%
Menendez [11]	3,096,791	< 45 to > 85	No AMI 60.5% AMI 49.5%
Shah [7]	45,943	N/R	THA 49% TKA 53%
Belmont [5]	46,322	N/R	THA + THA 60.5%
Anoushiravani [30]	4865	N/R	THA Normal 85.7% Underweight 85.3% TKA Normal 78.0% Underweight 78.5%

The number of participants in each study was included; however, it was not possible to calculate the total number of participants across studies due to a high likelihood of duplicate studies (since many studies used similar databases). In the majority of studies, an age range of the study participants was specified; study populations ranging between 18 and > 85 years old were included in this review. Female gender formed the majority of participants across most study groups. N/R not reported; AMI acute myocardial infarction