Table 1 Athlete countries ranked by mean race speed (km/h), with corresponding numbers of unique race records, runners, and races.

From: Analysis of the 50-mile ultramarathon distance using a predictive XGBoost model

Athlete country

Country code

Race speed (km/h)

Race records

Unique runners

Mean

Std

Min

Max

Bulgaria

BUL

10.77

3.29

6.28

16.21

16

10

Slovenia

SLO

10.18

2.13

5.34

13.80

16

11

New Zealand

NZL

9.78

2.50

3.81

15.74

685

369

Croatia

CRO

9.65

1.51

6.26

13.43

51

51

Ukraine

UKR

9.59

2.36

4.78

13.53

46

29

Hungary

HUN

9.31

1.87

3.49

14.51

335

237

Belarus

BLR

9.03

1.97

5.74

13.00

42

19

Slovakia

SVK

8.99

2.49

3.88

14.32

45

29

Lithuania

LTU

8.95

2.83

3.58

16.44

36

20

Latvia

LAT

8.86

1.64

5.50

11.55

27

23

Spain

ESP

8.75

2.34

3.43

14.69

207

154

Finland

FIN

8.75

2.05

4.01

16.23

278

203

Greece

GRE

8.58

2.59

5.28

14.73

61

19

Russia

RUS

8.57

2.30

3.36

14.82

747

526

Italy

ITA

8.55

2.14

3.43

15.25

1165

773

Australia

AUS

8.51

2.31

2.48

15.17

2469

1435

Czechia

CZE

8.39

1.98

4.30

14.06

97

62

Serbia

SRB

8.25

1.81

5.73

11.62

16

8

Austria

AUT

8.09

2.16

4.88

13.11

87

37

India

IND

8.05

1.41

5.68

12.36

99

43

Israel

ISR

8.03

1.75

5.32

11.07

22

16

Sweden

SWE

7.98

1.61

2.80

14.95

1467

1002

Ireland

IRL

7.95

1.78

3.89

15.48

754

447

Chile

CHI

7.95

1.21

5.09

11.12

34

21

Japan

JPN

7.91

2.03

2.88

16.22

724

404

Germany

GER

7.89

1.87

3.62

15.33

1523

882

Romania

ROU

7.88

1.97

4.54

11.90

22

17

Brazil

BRA

7.86

1.86

3.83

14.95

281

174

Belgium

BEL

7.86

1.88

3.77

14.35

592

477

El Salvador

ESA

7.85

0.84

5.70

9.56

29

6

Ecuador

ECU

7.80

1.73

5.25

10.96

29

21

Venezuela

VEN

7.73

1.35

5.21

10.90

36

23

Taiwan

TPE

7.73

1.55

1.83

12.16

2069

1249

Argentina

ARG

7.71

1.38

5.60

12.11

90

71

Colombia

COL

7.68

1.58

4.58

10.72

31

24

Switzerland

SUI

7.67

1.59

4.50

12.77

156

69

Canada

CAN

7.67

1.71

2.86

19.15

11,860

5311

Turkey

TUR

7.66

1.93

3.60

11.87

41

20

United States of America

USA

7.62

1.58

1.62

20.51

27,848

21,531

Puerto Rico

PUR

7.59

1.23

5.78

11.61

51

36

Costa Rica

CRC

7.56

1.27

5.25

9.92

46

33

Peru

PER

7.54

1.79

4.85

11.91

23

12

Denmark

DEN

7.48

1.35

4.13

13.52

1021

648

France

FRA

7.39

1.72

4.04

14.48

1279

984

Netherlands

NED

7.37

1.49

3.44

15.12

1059

694

Mexico

MEX

7.36

1.65

3.45

13.29

1912

1224

Guatemala

GUA

7.29

1.67

5.21

12.65

34

11

United Kingdom

GBR

7.19

1.78

3.04

20.12

27,277

13,366

Norway

NOR

7.18

1.77

3.15

13.22

495

355

Poland

POL

7.16

2.16

3.77

14.40

251

195

South Africa

RSA

7.16

2.06

3.35

16.60

727

582

China

CHN

7.16

2.55

3.38

13.28

250

213

Portugal

POR

7.07

1.33

4.30

11.05

70

62

Panama

PAN

6.88

1.54

4.67

10.89

19

11

Iceland

ISL

6.59

1.30

5.11

10.51

45

37

South Korea

KOR

6.03

1.56

3.55

12.75

255

191

Hong Kong

HKG

6.02

2.04

3.98

11.46

137

112

Singapore

SGP

6.01

1.22

4.20

9.99

33

23

Malaysia

MAS

5.70

1.15

3.10

10.16

39

31

Philippines

PHI

5.57

1.26

3.85

12.28

1050

570

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