Table 2.

Predictors of change in average alpha angle.

		Hips	Mean change in average alpha angle (± SD)	Univariate regression			Multivariate regression 1*			Multivariate regression 2**			Multivariate regression 3***
				Coefficient	95% CI	P value	Coefficient	95% CI	P value	Coefficient	95% CI	P value	Coefficient	95% CI	P value
Age at baseline	Months of age (continuous)	275	8.94 (± 7.79)	−0.11	−0.12 to −0.09	0.007	−0.01	−0.02 to −0.00	0.037	0.00	−0.00 to 0.01	0.285
	9–10 years	97	11.37 (± 8.74)	8.00	5.95 to 10.08	< 0.001
	11–12 years	72	12.63 (± 7.52)	9.27	7.21 to 11.33	< 0.001
	13–14 years	42	5.39 (± 4.47)	2.03	0.29 to 3.78	0.022
	15–16 years	48	3.45 (± 2.74)	0.10	−1.26 to 1.46	0.889
	17–18 years	16	3.36 (± 3.37)	–	–	–
Gender	Male	203	10.67 (± 8.05)	6.63	5.17 to 8.02	< 0.001				5.00	2.77 to 7.23	< 0.001	2.10	1.26 to 2.94	< 0.001
	Female	72	4.05 (± 4.13)	–	–	–				–	–	–
Physis	Open	151	12.59 (± 8.26)	9.95	8.54 to 11.37	< 0.001							9.29	7.50 to 11.08	< 0.001
	Open-closed	54	6.90 (± 4.38)	5.69	3.94 to 7.44	< 0.001							5.36	3.32 to 7.40	< 0.001
	Closed	70	2.64 (± 2.32)	–	–	–							–	–	–
BMI		275	–	−0.77	−1.29 to −0.25	0.034
Dominant leg	Dominant	152	9.28 (± 7.98)	0.77	1.07 to 2.60	0.413
	Non dominant	123	8.52 (± 7.56)	–	–	–
Cohort	Footballers	133	12.44 (± 8.45)	5.12	3.12 to 7.11	< 0.001	4.83	2.84 to 6.82	< 0.001
	Male controls	70	7.32 (± 5.97)	–	–	–	–	–	–
	Female controls	72	4.05 (± 4.13)	−3.28	4.96 to −1.59	< 0.001	−2.27	−4.12 to −0.43	0.016
PAQ	Continuous			2.90	2.10 to 3.70	0.014				0.79	0.56 to 1.01	< 0.001	1.00	0.55 to 1.44	< 0.001
	< 2	68	5.74 (± 6.61)	–	–	–
	2–3	72	7.06 (± 5.59)	1.32	−0.70 to 3.34	0.199
	3–4	103	10.67 (± 8.22)	4.93	2.71 to 7.15	< 0.001
	4–5	32	14.39 (± 8.76)	8.65	5.28 to 12.02	< 0.001

*Age and cohort as covariables.

**Age, gender, and Physical Activity Questionnaire as covariables.

***Physeal maturity, gender, and Physical Activity Questionnaire as covariables.