Table 1

Division, playing position, and age distribution of the cohort at the beginning of the study

Division	No	%	Playing position	No	%	Age distribution	No	%
*Percentage totals may be subject to rounding errors associated with individual components.
Premier	618	26	Goalkeeper	223	9	17–22	970	41
1st	712	30	Defender	817	34	23–28	817	34
2nd	550	23	Midfielder	739	31	29–34	508	21
3rd	496	21	Forward	597	25	35+	81	3
Total*	2376	100		2376	99		2376	99