| Risk factor | Mean medicalcost per injury†(95% CI) ($) | Wald p value | Mean human capitalcost per injury†(95% CI) ($) | Wald p value | Mean comprehensivecost per injury†(95% CI) ($) | Wald p value |
| Gender | ||||||
| Boys‡ | 526 (493–561) | <0.01 | 1701 (1590–1818) | <0.01 | 8682 (8201–9192) | <0.01 |
| Girls | 400 (374–429) | Referent | 1432 (1337–1532) | Referent | 6595 (6190–7026) | Referent |
| Boys¶ | 434 (400–470) | 0.13 | 1450 (1335–1575) | 0.74 | 7514 (7027–8035) | <0.01 |
| Girls | 401 (375–429) | Referent | 1427 (1338–1521) | Referent | 6490 (6042–6971) | Referent |
*Cost data were estimated for 2398 of 2990 reported injuries.
†Mean medical, human capital, and comprehensive costs are adjusted for gender, prior injury, study year, grade, multiple sports participation, coach EQT, years of playing experience, age, BMI, and competition division.
‡Adjusted mean costs include all 12 sports.
¶Adjusted mean costs are restricted to four pairs of gender-comparable sports (girls’ and boys’ soccer, girls’ and boys’ track, girls’ and boys’ basketball, and baseball and softball).