Table 4.

Odds ratios (95% CI) by gender and certification level (according to the certification of clubs and academies as classified by the Portuguese Football Association.) for youth soccer and futsal players examining RAE.

Certification level	Odds ratios (95% CI)
	Q1 vs. Q4	Q2 vs. Q4	Q3 vs. Q4	S1 vs. S2
Female
Soccer
No certification	1.10 (1.01–1.20)	1.16 (1.07–1.26)	1.03 (0.95–1.12)	1.12 (1.05–1.18)
BFTC	1.17 (0.84–1.63)	1.07 (0.76–1.49)	1.08 (0.78–1.50)	1.07 (0.85–1.35)
Football school	1.03 (0.75–1.43)	0.94 (0.67–1.31)	1.16 (0.85–1.59)	0.91 (0.72–1.14)
Training institution	0.91 (0.62–1.32)	1.05 (0.73–1.51)	0.89 (0.62–1.28)	1.04 (0.80–1.35)
Futsal
No certification	1.19 (1.06–1.34)	1.01 (0.90–1.14)	1.06 (0.95–1.20)	1.07 (0.98–1.16)
BFTC	1.80 (0.71–4.57)	1.63 (0.63–4.19)	1.50 (0.58–3.87)	1,36 (0.74–2.53)
Football school	---	---	---	---
Training institution	1.07 (0.71–1.63)	1.15 (0.77–1.73)	1.02 (0.68–1.54)	1.10 (0.83–1.47)
Male
Soccer
No certification	1.16 (1.14–1.19)	1.09 (1.06–1.11)	1.05 (1.03–1.08)	1.10 (1.08–1.11)
BFTC	1.23 (1.15–1.31)	1.17 (1.09–1.25)	1.07 (1.00–1.15)	1.15 (1.10–1.21)
Football school	1.16 (1.10–1.23)	1.11 (1.05–1.17)	1.04 (1.00–1.10)	1.11 (1.07–1.16)
Training institution	1.37 (1.33–1.41)	1.23 (1.19–1.27)	1.10 (1.07–1.14)	1.23 (1.21–1.26)
Futsal
No certification	1.02 (0.98–1.07)	1.01 (0.97–1.05)	1.01 (0.97–1.05)	1.01 (0.98–1.04)
BFTC	1.14 (1.00–1.30)	1.02 (0.90–1.16)	1.00 (0.88–1.14)	1.08 (0.99–1.18)
Football school	1.11 (0.95–1.29)	1.05 (0.90–1.22)	1.19 (1.03–1.37)	0.98 (0.89–1.09)
Training institution	1.27 (1.15–1.41)	1.25 (1.12–1.38)	1.13 (1.01–1.25)	1.18 (1.10–1.27)

BFTC, basic football training center. Values in bold are significant.