Table 1.

Cohort demographics.

		Baseline					Follow-up
		Individuals (hips)	Open physis	Partially open physis	Closed physis	PAQ score, mean (± SD)	Individuals (hips)	Open physis	Partially open physis	Closed physis	PAQ score, mean (± SD)
Male footballers
Age at baseline (years)	9–10	37 (73)	73	0	0	3.42 (± 0.43)	28 (56)	26	0	0	3.43 (± 0.86)
	11–12	32 (64)	64	0	0	3.36 (± 0.65)	22 (44)	58	0	0	3.39 (± 0.77)
	13–14	22 (44)	22	18	4	2.98 (± 0.73)	9 (18)	12	2	14	3.05 (± 0.32)
	15–16	20 (40)	2	10	28	2.51 (± 0.65)	7 (14)	0	0	12	2.93 (± 0.61)
	17–18	8 (16)	0	2	14	2.17 (± 0.40)	3 (6)	0	0	12	2.71 (± 0.23)
Total		119 (237)	161	30	46	3.11 (± 0.71)	69 (138)	96	2	40	3.29 (± 0.76)
Male controls
Age at baseline (years)	9–10	15 (30)	30	0	0	3.10 (± 0.46)	12 (24)	12	0	0	3.19 (± 0.77)
	11–12	14 (28)	28	0	0	3.28 (± 0.55)	10 (20)	18	4	0	2.90 (± 0.81)
	13–14	8 (16)	12	2	2	2.87 (± 0.59)	4 (8)	8	2	6	2.12 (± 0.67)
	15–16	13 (26)	10	2	14	2.22 (± 0.64)	8 (16)	0	0	14	2.41 (± 0.87)
	17–18	2 (4)	0	0	4	2.14 (± 0.44)	1 (2)	0	0	6	3.17 (± 0)
Total		52 (104)	80	4	20	2.86 (± 0.69)	35 (70)	38	6	26	2.80 (± 0.86)
Female controls
Age at baseline (years)	9–10	11 (22)	22	0	0	2.96 (± 0.51)	10 (20)	8	0	4	2.49 (± 0.80)
	11–12	6 (12)	10	2	0	2.72 (± 0.76)	5 (10)	2	2	10	2.00 (± 0.51)
	13–14	12 (24)	0	0	24	2.30 (± 0.56)	8 (16)	0	0	10	1.52 (± 0.38)
	15–16	19 (38)	0	0	38	2.14 (± 0.65)	9 (18)	0	0	18	1.77 (± 0.41)
	17–18	6 (12)	0	0	12	2.21 (± 0.58)	4 (8)	0	0	18	2.85 (± 0.96)
Total		54 (108)	32	2	74	2.42 (± 0.69)	36 (72)	10	2	60	2.07 (± 0.76)