Table 3.

Results of the Mann Whitney U test reporting differences and median (and interquartile range) performances between select/deselect groups in weekly and quarterly subjective gradings

Age group	RAG	U	Sig	Selected median (IQR)	Deselected median (IQR)	ϒ	η2
Weekly
U10	Red	7.0	0.15	4 (2–4)	6 (4–7)	− 0.45	0.20
	Amber	14.5	0.81	13 (12–14)	13 (11–14)	− 0.07	0.01
	Green	3.0	0.03	6 (4–6)	1 (0–2)	− 0.65	0.43
U13	Red	9.0	0.14	0 (0–1)	1 (0–2)	− 0.17	0.03
	Amber	7.5	0.08	9 (8–12)	12 (11–12)	− 0.36	0.13
	Green	4.5	0.02	2 (2–3)	2 (1–2)	− 0.49	0.24
U14	Red	4.5	0.01*	0 (0–0)	1 (1–2)	− 0.82	0.67
	Amber	13.0	0.11	10 (10–11)	14 (13–15)	− 0.43	0.19
	Green	0.0	< 0.001*	7 (7–9)	2 (1–3)	− 0.83	0.68
U15	Red	30.0	0.62	0 (0–0)	0 (0–0)	− 0.12	0.01
	Amber	12.0	0.02	7 (3–9)	10 (9–12)	− 0.53	0.28
	Green	11.0	0.02	16 (13–18)	10 (4–13)	− 0.39	0.15
U16	Red	31.5	0.96	0 (0–0)	0 (0–0)	− 0.02	0.00
	Amber	18.0	0.16	2 (1–3)	4 (3–6)	− 0.37	0.14
	Green	23.0	0.38	8 (8–9)	8 (5–9)	− 0.24	0.06
Quarterly
U10	Red	4.5	0.18	0 (0–0)	1 (1–2)	− 0.53	0.29
	Amber	8.0	0.67	1 (1–2)	1 (1–1)	− 0.20	0.04
	Green	7.0	0.52	1 (0–2)	0 (0–1)	− 0.27	0.07
U13	Red	1.0	< 0.001*	0 (0–0)	2 (2–2)	− 0.80	0.65
	Amber	19.0	0.95	2 (0–2)	1 (1–1)	− 0.04	0.00
	Green	6.0	0.05	1 (0–3)	0 (0–0)	− 0.57	0.33
U14	Red	0.0	< 0.001*	0 (0–0)	2 (1–2)	− 0.92	0.85
	Amber	18.0	0.49	0 (0–2)	1 (0–2)	− 0.23	0.05
	Green	6.0	0.02	3 (1–3)	0 (0–1)	− 0.66	0.43
U15	Red	0.0	< 0.001*	0 (0–0)	1 (1–2)	− 0.95	0.91
	Amber	12.5	0.09	1 (0–1)	2 (1–2)	− 0.45	0.20
	Green	2.5	< 0.001*	2 (2–3)	0 (0–0)	− 0.74	0.55
U16	Red	2.5	< 0.001*	0 (0–0)	1 (1–1)	− 0.83	0.69
	Amber	17.5	0.41	1 (0–1)	1 (0–1)	− 0.24	0.06
	Green	7.0	0.03	2 (2–3)	1 (0–1)	− 0.61	0.37

IQR interquartile range (25%–75%)

^* = significant outcome < 0.017 (with Bonferroni correction)