ORs and 95% CIs for gross domestic product (GDP) per capita and number of athletes in the multivariable analysis
| OR | 95% CI | P value | |
| GDP per capita | |||
| <US$2985 | Reference | ||
| US$2986–US$10 545 | 3.04 | 1.45 to 6.38 | <0.01 |
| US$10 546–US$31 860 | 2.69 | 0.49 to 14.9 | 0.26 |
| >US$31 860 | 6.07 | 1.36 to 27.09 | 0.02 |
| No of athletes | |||
| <12 | Reference | ||
| 13–50 | 3.01 | 0.32 to 28.28 | 0.33 |
| 51–121 | 14.66 | 6.82 to 31.48 | <0.01 |
| >121 | 4.26 | 1.16 to 15.70 | 0.03 |