Table 1.

Mean cartilage alpha angle, mean epiphyseal extension and mean epiphyseal tilt with an open and closed physis for all participants

Mean cartilage alpha angle
Clockface position	Open physis (247 hips)		Closed physis (168 hips)		t-Test
	Mean	SD	Mean	SD	Difference	p Value
11 o’clock	46.69	6.23	53.15	13.67	+6.46	<0.001
12 o’clock	49.99	9.10	60.29	15.39	+10.30	<0.001
1 o’clock	53.18	11.20	65.23	17.21	+12.06	<0.001
2 o’clock	52.21	7.78	63.14	13.94	+10.93	<0.001
3 o’clock	47.24	7.78	53.45	12.60	+6.21	<0.001
Maximum all positions	57.56	11.67	70.80	16.04	+13.24	<0.001

Mean physeal extension
Clockface position	Open physis (247 hips)		Closed physis (168 hips)		t-Test
	Mean	SD	Mean	SD	Difference	p Value
11 o’clock	0.716	0.037	0.770	0.052	+0.055	<0.001
12 o’clock	0.673	0.042	0.767	0.070	+0.095	<0.001
1 o’clock	0.682	0.052	0.799	0.075	+0.117	<0.001
2 o’clock	0.655	0.054	0.784	0.065	+0.130	<0.001
3 o’clock	0.577	0.051	0.690	0.063	+0.113	<0.001

Mean physeal tilt
Clockface position	Open physis (247 hips)		Closed physis (168 hips)		t-Test
	Mean	SD	Mean	SD	Difference	p Value
11 o’clock	1.59	0.180	1.40	0.153	−0.193	<0.001
12 o’clock	1.52	0.169	1.44	0.169	−0.089	<0.001
1 o’clock	1.56	0.220	1.58	0.220	+0.024	0.270
2 o’clock	1.31	0.199	1.42	0.207	+0.107	<0.001
3 o’clock	0.93	0.100	1.05	0.126	+0.120	<0.001